EUROPEAN ORGANIZATION FOR NUCLEAR RESEARCH (CERN)

CERN-EP-2018-2232018/09/20

CMS-HIG-18-016

Observation of Higgs boson decay to bottom quarks

The CMS Collaboration∗

Abstract

The observation of the standard model (SM) Higgs boson decay to a pair of bottomquarks is presented. The main contribution to this result is from processes in whichHiggs bosons are produced in association with a W or Z boson (VH), and are searchedfor in final states including 0, 1, or 2 charged leptons and two identified bottom quarkjets. The results from the measurement of these processes in a data sample recordedby the CMS experiment in 2017, comprising 41.3 fb−1 of proton-proton collisions at√

s = 13 TeV, are described. When combined with previous VH measurements usingdata collected at

√s = 7, 8, and 13 TeV, an excess of events is observed at mH =

125 GeV with a significance of 4.8 standard deviations, where the expectation for theSM Higgs boson is 4.9. The corresponding measured signal strength is 1.01± 0.22.The combination of this result with searches by the CMS experiment for H → bbin other production processes yields an observed (expected) significance of 5.6 (5.5)standard deviations and a signal strength of 1.04± 0.20.

Published in Physical Review Letters as doi:10.1103/PhysRevLett.121.121801.

c© 2018 CERN for the benefit of the CMS Collaboration. CC-BY-4.0 license

∗See Appendix A for the list of collaboration members

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Since the discovery of a new boson with a mass near 125 GeV by the ATLAS [1] and CMS [2, 3]Collaborations, rapid progress in the understanding of its properties and couplings has re-vealed that the new particle is compatible with the standard model (SM) Higgs boson H [4–9].Observation of Higgs boson decays in the γγ, ZZ, WW, and ττ modes have been reported [10–20], and all measured properties [21–29] support this hypothesis. Recently, the CMS and AT-LAS Collaborations reported observations of the Higgs boson produced in association with atop quark pair that are compatible with the SM prediction, representing the first direct mea-surements of the Higgs boson coupling to quarks [30, 31].

The decay H → bb, with a predicted branching fraction of about 58% [32] for a Higgs bosonmass of mH = 125 GeV, is the most prevalent decay mode but has not yet been establishedunequivocally. A precise measurement of the rate for this process directly probes the Yukawacoupling of the Higgs boson to a down-type quark, and provides a necessary test of the hy-pothesis that the Higgs field is the source of mass generation in the charged fermion sector ofthe SM [33, 34]. At both the LHC and the Tevatron the most sensitive production process in thesearch for H → bb decays is when the Higgs boson is produced in association with a vectorboson (VH). The CDF and D0 Collaborations at the Tevatron reported an excess of events inthis channel with a significance of 2.8 standard deviations (σ) at a mass of mH = 125 GeV [35].Last year, the ATLAS and CMS Collaborations reported evidence for the VH, H → bb processat a mass of mH = 125 GeV corresponding to observed (expected) significances of 3.6 (4.0)σ and3.8 (3.8)σ, respectively, combining data collected during Run 1 at

√s = 7 and 8 TeV, and Run

2 at 13 TeV [36, 37]. Searches for the H → bb decay in other production processes, with lesssensitivity than VH, have also been reported at the LHC [38–44].

In this Letter we present an observation of the Higgs boson decay to bottom quarks. The mea-surement described here examines the VH production process, where the Higgs boson is pro-duced in association with a W or Z boson and decays into bb. The data comprise proton-proton(pp) collisions recorded at

√s = 13 TeV by the CMS detector at the LHC in 2017, correspond-

ing to a total integrated luminosity of 41.3 fb−1 [45]. Five distinct final states are considered:Z(νν)H, W(µν)H, W(eν)H, Z(µµ)H, and Z(ee)H, corresponding to three channels with 0, 1, or 2charged leptons from the vector boson decay. In addition, two identified jets due to hadroniza-tion of bottom quarks (b jets) from the Higgs boson decay are required. Important backgroundprocesses include the production of W and Z bosons in association with jets (V+jets), produc-tion of top quark pairs (tt) and single top quarks (t), diboson (WW, WZ, ZZ), and multijet(QCD) events.

The analysis presented here closely follows the methods previously used to search for the VH,H→ bb process [37] and incorporates several improvements, including more efficient identifi-cation of b jets, better dijet mass resolution, and the use of different multivariate discriminanttechniques that better separate signal from background. For each channel, a signal region en-riched in VH events is selected together with several control regions, each enriched in eventsfrom individual background processes. A simultaneous binned-likelihood fit to the shape andyield (normalization) of specific distributions for the signal and control regions for all channelscombined is used to extract a possible Higgs boson signal. To validate the procedure, the samemethodology is used to extract a signal for the associated production process VZ, with Z→ bb,which has an identical final state to VH with H → bb, but with a production cross section 5 to15 times larger, depending on the kinematic regime considered. The result from this measure-ment is combined with those of similar measurements performed by the CMS Collaborationusing 2016 data and Run 1 data, in the VH and other production processes. This combinationleads to an observation of the Higgs boson decay to bottom quarks. An observation of thisdecay mode by the ATLAS Collaboration [46] was submitted for publication at the same time

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as this Letter.

The central feature of the CMS apparatus is a superconducting solenoid of 6 m internal diame-ter, providing a magnetic field of 3.8 T. A silicon pixel and strip tracker, a lead tungstate crystalelectromagnetic calorimeter, and a brass and scintillator hadron calorimeter, each composed ofa barrel and two endcap sections, reside within the solenoid. Forward calorimeters extend thepseudorapidity coverage provided by the barrel and endcap detectors. Muons are detected ingas-ionization chambers embedded in the steel flux-return yoke outside the solenoid. A moredetailed description of the CMS detector, together with a definition of the coordinate systemand the relevant kinematic variables, can be found in [47].

Signal and background processes are simulated with several Monte Carlo (MC) event genera-tors, while the CMS detector response is modeled with GEANT4 [48]. The quark-induced ZHand WH signal processes are generated at next-to-leading order (NLO) QCD accuracy usingthe POWHEG v2 [49–51] event generator extended with the MiNLO procedure [52, 53], whilethe gluon-induced ZH process is generated at leading order (LO) accuracy with POWHEG v2.The Higgs boson mass is set to 125 GeV for all signal samples. Diboson background events aregenerated with MADGRAPH5 aMC@NLO v2.4.2 [54] at NLO with the FxFx merging scheme [55]and up to two additional partons. The same generator is used at LO accuracy with the MLMmatching scheme [56] to generate V+jets events in inclusive and b-quark enriched configura-tions with up to four additional partons, and to generate a sample of QCD events. The tt [57]and single t production processes in the tW [58] and t [59] channels are generated to NLOaccuracy with POWHEG v2, while the s channel [60] single t process is generated with MAD-GRAPH5 aMC@NLO v2.4.2. The parton distribution functions used to produce all samples arethe next-to-next-to-leading order (NNLO) NNPDF3.1 set [61]. For parton showering and had-ronization, the matrix element generators are interfaced with PYTHIA v8.230 [62]. For all sam-ples, simulated additional pp interactions (pileup) are added to the hard-scattering processwith the multiplicity distribution matched to the 2017 data.

The production cross sections for the signal samples are rescaled as a function of the vectorboson transverse momentum, pT(V), to NNLO QCD + NLO electroweak accuracy combiningthe VHNNLO [63–66], VH@NNLO [67, 68], and HAWK v2.0 [69] generators as described in [32].The production cross sections for the tt samples are rescaled to the NNLO prediction with thenext-to-next-to-leading-log result obtained from TOP++ v2.0 [70], while the V+jets samples arerescaled to the NNLO cross sections using FEWZ 3.1 [71]. In the V+jets samples used in thisanalysis, the pT(V) spectrum in data is observed to be softer than in simulated samples, asexpected from higher-order electroweak corrections to the production processes [72]. Events ineach channel are reweighted to account for electroweak corrections to pT(V), which reach upto 10% for pT(V) near 400 GeV. In addition, a differential LO-to-NLO correction is applied asa function of the separation in η between the two jets from the Higgs boson decay [37]. Thett samples are reweighted as a function of top quark pT to account for the known differencebetween data and simulation [73].

The CMS particle-flow (PF) event algorithm [74] is used to reconstruct and identify individ-ual particles (PF objects) with an optimized combination of information from the various ele-ments of the CMS detector. This algorithm is employed at the trigger level, and in the moredetailed reconstruction of data that occurs offline. The objects identified by the algorithm com-prise candidate electrons, muons, photons, and charged as well as neutral hadrons. Jets arereconstructed from PF objects using the anti-kT clustering algorithm [75] implemented in theFASTJET package [76, 77], with a distance parameter of 0.4. The missing transverse momen-tum vector ~pmiss

T is defined as the negative vectorial pT sum of all the PF objects identified in

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the event, and its magnitude is referred to as pmissT .

The reconstructed vertex with the largest value of summed physics-object p2T is considered

to be the primary pp interaction vertex. The physics objects used in this calculation are jetsclustered using the jet finding algorithm with the tracks assigned to the vertex as inputs, andthe associated missing transverse momentum computed as the negative vectorial pT sum ofthose jets. All charged hadrons that originate from pileup are removed from consideration inthe event. In addition, the average neutral energy density from pileup is evaluated from PFobjects and subtracted from the reconstructed jets as well as from the summed energy in thevicinity of leptons (isolation), as described in [74].

Events of interest are selected online using a two-tiered trigger system [78] based on customhardware processors and a farm of commercial processors running a version of the full offlinereconstruction software optimized for speed. Events in the 0-lepton channel are selected pri-marily by a trigger requiring both pmiss

T and HmissT to be larger than 120 GeV, where Hmiss

T isdefined as the magnitude of the negative vectorial pT sum of all jets. Single-lepton triggers areused to select events in the 1-lepton channel, where the leptons are required to be isolated fromother PF objects. The single-muon trigger requires pT > 27 GeV, while the single-electron trig-ger requires pT > 32 GeV. For the 2-lepton channel, dilepton triggers are employed with mini-mum pT requirements of (17, 8)GeV for the two muons and (23, 12)GeV for the two electrons.After offline requirements, the 0-lepton trigger efficiency reaches 100% above pmiss

T ∼ 220 GeV,while the 1-lepton triggers have efficiencies of approximately 95% for muons and 90% for elec-trons, and the dilepton trigger efficiency is approximately 91% for muons and 96% for electrons.

Events are selected offline based on the presence of 0, 1, or 2 leptons (muons or electrons) andtwo identified b jets. Muons and electrons from W or Z boson decays are identified using theselection criteria defined in [37], including stringent quality and isolation requirements. Thelepton pT requirements are pT > 25 (30)GeV for muons (electrons) in the 1-lepton channel, andpT > 20 GeV for each lepton in the 2-lepton channel. In the 0- and 1-lepton channels, eventswith additional isolated muons or electrons are rejected. Minimum pT requirements of (60, 35),(25, 25), and (20, 20)GeV are applied on the two jets forming the Higgs boson candidate in the0-, 1-, and 2-lepton channels, respectively, which are also required to satisfy |η| < 2.5.

The reconstruction of vector boson decays differs by channel. In the 0-lepton channel, pmissT is

interpreted as the pT of the Z boson, while in the 2-lepton channel the Z boson is reconstructeddirectly from lepton pairs requiring an invariant mass in the range 75–105 GeV. In the 1-leptonchannel, the W boson candidate is reconstructed from the ~pT of the single isolated lepton and~pmiss

T .

Higgs boson candidates are reconstructed from the pair of jets (“jj”) in the event most likely tooriginate from b quarks, as determined by a combined secondary vertex algorithm (deepCSV)based on a deep neural network discriminant (DNN) [79]. The deepCSV algorithm providesa continuous discriminator score combining information about tracks displaced from the pri-mary vertex, identified secondary vertices, jet kinematic variables, and information related tothe presence of soft leptons in the jet. Of the two jets forming the Higgs boson candidate, theone with a larger deepCSV score is required to satisfy a tight working point with misidenti-fication rate of 0.1% for light quark and gluon jets, while the jet with a lower deepCSV score(DCSV2) must satisfy a loose working point with a 10% misidentification rate.

All backgrounds are substantially reduced by requiring large pT(V) [80]. The requirements arepmiss

T > 170 GeV and pT(V) > 150 GeV in the 0- and 1-lepton channels, respectively, while tworegions are used in the 2-lepton channel: 50 < pT(V) ≤ 150 GeV and pT(V) > 150 GeV. Resid-

4

ual backgrounds from tt and QCD processes are reduced in the 1-lepton channel by rejectingevents with more than one extra jet satisfying pT > 30 GeV and |η| < 2.5, and in the 0-leptonchannel with additional requirements on the angular separation between ~pmiss

T and its nearestjet.

After all event selection criteria are applied, the resolution on the dijet invariant mass m(jj)of reconstructed Higgs boson decays is approximately 15%. The mass resolution is improvedby applying a multivariate regression technique similar to that employed in [37], with a DNNtrained on b jets from simulated tt events with input variables that include several properties ofany secondary vertices in the jet, as well as the energy and composition of the jet. In addition,recovery of final-state radiation is achieved by adding to the m(jj) calculation the momenta ofjets near to either of the Higgs boson candidate jets. In the 2-lepton channel, with no genuine~pmiss

T from the hard-scattering process, a kinematic fit of the entire event is performed requir-ing pT balance between the dilepton and dijet systems within the experimental uncertainty. Allthree improvements are validated in data by studying the pT(``)/pT(jj) distribution in sam-ples of Z→ `` events containing at least one b-tagged jet, and by studying the top quark massdistribution in a high-purity sample of tt events. After these improvements, the average resolu-tion on m(jj) is in the 10–13% range, depending on the channel and the pT of the reconstructedHiggs boson.

For each channel, a signal region enriched in VH events is selected together with several con-trol regions, each enriched in events from individual background processes. The signal regionsare defined as 60 < m(jj) < 160 GeV in the 0-lepton channel, and 90 < m(jj) < 150 GeV in the1- and 2-lepton channels. The score of a DNN for events in each of these signal regions, whichfurther separates signal from background, is used in the signal extraction fit. The DNNs aretrained separately for each channel using simulated samples for signal and all background pro-cesses. The set of input variables is chosen by an iterative optimization procedure from a largenumber of potentially discriminating variables. Among the most discriminating variables forall channels are m(jj), pT(V), DCSV2, the number of additional jets, and the angular separationbetween the two jets forming the Higgs boson candidate. Events in control regions are usedin the fit to normalize the major background processes directly from data. These regions areselected for tt production (TT), and for the production of W and Z bosons in association witheither predominantly heavy-flavor (HF) or light-flavor (LF) jets using the criteria describedin [37].

The signal strength µ, defined as the measured production cross section times branching frac-tion divided by the expected SM value, is extracted from a simultaneous binned fit of the signaland control regions. The DNN score is used as the fitted variable in each signal region, whiledifferent strategies are used in the control regions. For the TT and LF control regions, only theyields of these processes are considered in the fit. For the HF control region, DCSV2 is usedas the fitted variable in the 2-lepton channel, while the score of a dedicated DNN (DNNHF)is used in the 0- and 1-lepton channels. The DNNHF uses the same variables as the signalregion DNN, but is trained to individually distinguish the tt, single t, and V+jets backgroundprocesses.

The significance of the observed excess of events in the fit is computed using the profile like-lihood asymptotic approximation [81–84]. All results reported here are obtained for a Higgsboson mass of mH = 125.09 GeV [26]. For the 2017 data, the observed significance is 3.3σabove the background-only hypothesis, while 3.1σ is expected for the SM Higgs boson. Thecorresponding measured signal strength is µ = 1.08± 0.34, where the uncertainty is a combi-nation of statistical and systematic components. Table 1 lists the major sources of uncertainty

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and their observed impact on µ from the fit. Dominant systematic uncertainties arise from thebackground normalizations, simulated sample size, b-tagging efficiency and misidentificationrates, and V+jets modeling. All sources of systematic uncertainty are included in the fit asindependent nuisance parameters.

Table 1: Major sources of uncertainty in the measurement of the signal strength µ, and theirobserved impact (∆µ) from a fit to the 2017 data set, are listed. The total uncertainty is separatedinto four components: statistical (including data yields), experimental, MC sample size, andtheory. Detailed decompositions of the statistical, experimental, and theory components arespecified. The impact of each uncertainty is evaluated considering only that source. Because ofcorrelations in the combined fit between nuisance parameters in different sources, the sum inquadrature for each source does not in general equal the total uncertainty of each component.

Uncertainty source ∆µ

Statistical +0.26 −0.26Normalization of backgrounds +0.12 −0.12

Experimental +0.16 −0.15b-tagging efficiency and misid +0.09 −0.08V+jets modeling +0.08 −0.07Jet energy scale and resolution +0.05 −0.05Lepton identification +0.02 −0.01Luminosity +0.03 −0.03Other experimental uncertainties +0.06 −0.05

MC sample size +0.12 −0.12

Theory +0.11 −0.09Background modeling +0.08 −0.08Signal modeling +0.07 −0.04

Total +0.35 −0.33

The VZ process with Z → bb, having an identical final state as the VH process with H → bb,serves to validate the methodology used in the search for the latter process. To extract this di-boson signal, the DNNs are trained using the simulated samples for this process as signal. Allother processes, including VH production (at the predicted SM rate), are treated as background.The only modification made to the analysis is the requirement that the signal region is in the in-terval [60, 160]GeV in m(jj) for all channels. The excess of events for the combined WZ and ZZproduction processes has an observed significance of 5.2σ from the background-only hypothe-sis, where 5.0σ is expected. The corresponding observed signal strength is µ = 1.05± 0.22.

Measurements of the VH process with H → bb reported above are combined with the re-sults of a similar measurement performed by the CMS Collaboration using data collected at13 TeV in 2016 corresponding to 35.9 fb−1 [37]. All systematic uncertainties are assumed to beuncorrelated in this fit, except for theory uncertainties and the dominant uncertainties in themeasurement of the jet energy scale, which are assumed to be fully correlated. The Run 2 (2016and 2017 data sets) combination yields an observed signal significance of 4.4σ, where 4.2σ isexpected, and a signal strength of µ = 1.06± 0.26.

The results VH from Run 2 are combined with the results of a similar CMS analysis of the Run 1data using pp collisions at

√s = 7 and 8 TeV with data samples corresponding to integrated lu-

minosities of up to 5.1 and 18.9 fb−1, respectively [25, 44]. Systematic uncertainties in this fit areassumed to be uncorrelated for separate collision energies, except for the theory uncertainties.

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Ent

ries

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310

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710DataBackground

bb→VH,HBackground uncertaintySignal + Background

CMS

(13 TeV)-1 (8 TeV) + 77.2 fb-1 (7 TeV) + 18.9 fb-15.1 fb

bb→VH, H

(S/B)10

log3− 2.5− 2− 1.5− 1− 0.5− 0

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µBest fit 0 0.5 1 1.5 2 2.5 3 3.5 4

Combined

Run 1

2017

2016

Run 2

0.14 (syst)± 0.17 (stat) ±1.01

0.24 (syst)± 0.38 (stat) ±0.89

0.34±1.08

0.39±1.19

0.17 (syst)± 0.20 (stat) ±1.06

CMS (13 TeV)-1 (8 TeV) + 77.2 fb-1 (7 TeV) + 18.9 fb-15.1 fb

bb→VH, H

Observed syst)⊕ (stat σ1±

20162017

(syst)σ1±

Figure 1: Left: distributions of signal, background, and data event yields sorted into bins ofsimilar signal-to-background ratio, as given by the result of the fit to their corresponding mul-tivariate discriminant. All events in the VH, H → bb signal regions of the combined Run 1and Run 2 data sets are included. The red histogram indicates the Higgs boson signal con-tribution, while the grey histogram is the sum of all background yields. The bottom panelshows the ratio of the data to the background, with the total uncertainty in the backgroundyield indicated by the grey hatching. The red line indicates the sum of signal plus backgroundcontribution divided by the background yield. Right: best-fit value of the signal strength µ, atmH = 125.09 GeV, for the fit of all VH, H→ bb channels in the Run 1 and Run 2 data sets. Alsoshown are the individual results of the 2016 and 2017 measurements, the Run 2 combination,and the Run 1 result. Horizontal error bars indicate the 1σ systematic (red) and 1σ total (blue)uncertainties, and the vertical dashed line indicates the SM expectation.

The combination yields an observed signal significance of 4.8σ, where 4.9σ is expected. Themeasured signal strength is µ = 1.01± 0.22 [0.17 (stat)± 0.09 (exp)± 0.06 (MC)± 0.08 (theo)],where the decomposition of the total uncertainty into its components is specified in bracketsfollowing the definitions in Table 1. Figure 1 (left) shows the distribution of events in all chan-nels sorted according to the observed value of log10 (S/B) for the combined Run 1 and Run2 data sets, where signal S and background B yields are determined from the correspondingdiscriminant score used in each analysis (DNNs for the 2017 data set, boosted decision trees forall other data sets). Figure 1 (right) summarizes the signal strengths for VH production, withH → bb, separately for the different data sets and the combination, while Table 2 summarizesthe significances, also including a breakdown of the 2017 results separated by channel.

An alternative to fitting the DNN score is to fit the m(jj) distribution, which results in less sen-sitivity but enables a more direct visualization of the Higgs boson signal. As in the VZ analysis,the signal region is defined to be in the interval [60, 160]GeV in m(jj). This study is performedonly with the 2016 and 2017 data sets, in which events are categorized into four bins of in-creasing signal-to-background ratio according to the score of their corresponding discriminant,obtained with those input variables correlated with m(jj) fixed to their mean values. The result-ing four m(jj) distributions in each data set are fit together with the same distributions used inthe control regions, described above, to extract signal and background yields. The fitted m(jj)distributions are combined and weighted by S/(S + B), where S and B are computed fromthe Higgs boson signal yield and the sum of all background yields for each category consid-ering their fitted normalizations, respectively. The resulting combined m(jj) distribution, afterbackground subtraction, is shown in Fig. 2, where the VH and VZ contributions are separately

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Table 2: Expected and observed significances, in σ, and observed signal strengths for the VHproduction process with H → bb. Results are shown separately for 2017 data, combined Run2 (2016 and 2017) data, and for the combination of the Run 1 and Run 2 data sets. For the2017 analysis, results are shown separately for the individual signal strengths for each channelfrom a combined simultaneous fit to all channels. All results are obtained for mH = 125.09 GeVcombining statistical and systematic uncertainties.

Significance (σ)Data set Expected Observed Signal strength2017

0-lepton 1.9 1.3 0.73± 0.651-lepton 1.8 2.6 1.32± 0.552-lepton 1.9 1.9 1.05± 0.59Combined 3.1 3.3 1.08± 0.34

Run 2 4.2 4.4 1.06± 0.26

Run 1 + Run 2 4.9 4.8 1.01± 0.22

visible.

m(jj) [GeV]60 80 100 120 140 160

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S+

B)

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ghte

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trie

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Figure 2: Dijet invariant mass distribution for events weighted by S/(S + B) in all channelscombined in the 2016 and 2017 data sets. Weights are derived from a fit to the m(jj) distribu-tion, as described in the text. Shown are data (points) and the fitted VH signal (red) and VZbackground (grey) distributions, with all other fitted background processes subtracted. The er-ror bar for each bin represents the pre-subtraction 1σ statistical uncertainty on the data, whilethe grey hatching indicates the 1σ total uncertainty on the signal and all background compo-nents.

A combination of CMS measurements of the H→ bb decay is performed, including dedicatedanalyses for the following production processes: VH (reported above), gluon fusion [38], vec-tor boson fusion [44], and associated production with top quarks [30, 41, 42]. These analysesuse data collected at 7, 8 and 13 TeV, depending on the process. In this fit, most sources of

8

systematic uncertainty are treated as uncorrelated. The dominant jet energy scale uncertaintiesare treated as correlated between processes at the same collision energy, while the theory un-certainties are correlated between all processes and data sets. The observed (expected) signalsignificance is 5.6 (5.5)σ, and the measured signal strength is µ = 1.04± 0.20. In addition tothe overall signal strength for the H → bb decay, the signal strengths for the individual pro-duction processes are also determined in this combination, where contributions from a singleproduction process to multiple channels are properly accounted for in the fit. All results aresummarized in Fig. 3.

µBest fit 0 1 2 3 4 5 6 7 8 9

Combined

ZH

WH

ttH

VBF

ggF

stat syst

0.14± 0.14 ±1.04

0.16± 0.24 ±0.88

0.24± 0.29 ±1.24

0.37± 0.23 ±0.85

1.17± 0.98 ±2.53

1.30± 2.08 ±2.80

CMS (13 TeV)-1 77.2 fb≤ (8 TeV) + -1 19.8 fb≤ (7 TeV) + -1 5.1 fb≤

bb→H

Observed syst)⊕ (stat σ1±

(syst)σ1±

Figure 3: Best-fit value of the H → bb signal strength with its 1σ systematic (red) and total(blue) uncertainties for the five individual production modes considered, as well as the overallcombined result. The vertical dashed line indicates the standard model expectation. All resultsare extracted from a single fit combining all input analyses, with mH = 125.09 GeV.

In summary, measurement of the standard model Higgs boson decaying to bottom quarkshas been presented. A combination of all CMS measurements of the VH, H → bb processusing proton-proton collisions recorded at center of mass energies of 7, 8, and 13 TeV, yields anobserved (expected) significance of 4.8 (4.9) standard deviations at mH = 125.09 GeV, and thesignal strength is µ = 1.01± 0.22. Combining this result with previous measurements by theCMS Collaboration of the H→ bb decay in events where the Higgs boson is produced throughgluon fusion, vector boson fusion, or in association with top quarks, the observed (expected)significance increases to 5.6 (5.5) standard deviations and the signal strength is µ = 1.04± 0.20.This constitutes the observation of the H→ bb decay by the CMS Collaboration.

AcknowledgmentsWe congratulate our colleagues in the CERN accelerator departments for the excellent perfor-mance of the LHC and thank the technical and administrative staffs at CERN and at other CMSinstitutes for their contributions to the success of the CMS effort. In addition, we gratefullyacknowledge the computing centers and personnel of the Worldwide LHC Computing Gridfor delivering so effectively the computing infrastructure essential to our analyses. Finally,we acknowledge the enduring support for the construction and operation of the LHC and theCMS detector provided by the following funding agencies: BMBWF and FWF (Austria); FNRSand FWO (Belgium); CNPq, CAPES, FAPERJ, FAPERGS, and FAPESP (Brazil); MES (Bulgaria);

References 9

CERN; CAS, MoST, and NSFC (China); COLCIENCIAS (Colombia); MSES and CSF (Croa-tia); RPF (Cyprus); SENESCYT (Ecuador); MoER, ERC IUT, and ERDF (Estonia); Academy ofFinland, MEC, and HIP (Finland); CEA and CNRS/IN2P3 (France); BMBF, DFG, and HGF(Germany); GSRT (Greece); NKFIA (Hungary); DAE and DST (India); IPM (Iran); SFI (Ireland);INFN (Italy); MSIP and NRF (Republic of Korea); MES (Latvia); LAS (Lithuania); MOE and UM(Malaysia); BUAP, CINVESTAV, CONACYT, LNS, SEP, and UASLP-FAI (Mexico); MOS (Mon-tenegro); MBIE (New Zealand); PAEC (Pakistan); MSHE and NSC (Poland); FCT (Portugal);JINR (Dubna); MON, RosAtom, RAS, RFBR, and NRC KI (Russia); MESTD (Serbia); SEIDI,CPAN, PCTI, and FEDER (Spain); MOSTR (Sri Lanka); Swiss Funding Agencies (Switzerland);MST (Taipei); ThEPCenter, IPST, STAR, and NSTDA (Thailand); TUBITAK and TAEK (Turkey);NASU and SFFR (Ukraine); STFC (United Kingdom); DOE and NSF (USA).

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17

A The CMS CollaborationYerevan Physics Institute, Yerevan, ArmeniaA.M. Sirunyan, A. Tumasyan

Institut fur Hochenergiephysik, Wien, AustriaW. Adam, F. Ambrogi, E. Asilar, T. Bergauer, J. Brandstetter, M. Dragicevic, J. Ero,A. Escalante Del Valle, M. Flechl, R. Fruhwirth1, V.M. Ghete, J. Hrubec, M. Jeitler1, N. Krammer,I. Kratschmer, D. Liko, T. Madlener, I. Mikulec, N. Rad, H. Rohringer, J. Schieck1, R. Schofbeck,M. Spanring, D. Spitzbart, W. Waltenberger, J. Wittmann, C.-E. Wulz1, M. Zarucki

Institute for Nuclear Problems, Minsk, BelarusV. Chekhovsky, V. Mossolov, J. Suarez Gonzalez

Universiteit Antwerpen, Antwerpen, BelgiumE.A. De Wolf, D. Di Croce, X. Janssen, J. Lauwers, M. Pieters, H. Van Haevermaet,P. Van Mechelen, N. Van Remortel

Vrije Universiteit Brussel, Brussel, BelgiumS. Abu Zeid, F. Blekman, J. D’Hondt, J. De Clercq, K. Deroover, G. Flouris, D. Lontkovskyi,S. Lowette, I. Marchesini, S. Moortgat, L. Moreels, Q. Python, K. Skovpen, S. Tavernier,W. Van Doninck, P. Van Mulders, I. Van Parijs

Universite Libre de Bruxelles, Bruxelles, BelgiumD. Beghin, B. Bilin, H. Brun, B. Clerbaux, G. De Lentdecker, H. Delannoy, B. Dorney,G. Fasanella, L. Favart, R. Goldouzian, A. Grebenyuk, A.K. Kalsi, T. Lenzi, J. Luetic, N. Postiau,E. Starling, L. Thomas, C. Vander Velde, P. Vanlaer, D. Vannerom, Q. Wang

Ghent University, Ghent, BelgiumT. Cornelis, D. Dobur, A. Fagot, M. Gul, I. Khvastunov2, D. Poyraz, C. Roskas, D. Trocino,M. Tytgat, W. Verbeke, B. Vermassen, M. Vit, N. Zaganidis

Universite Catholique de Louvain, Louvain-la-Neuve, BelgiumH. Bakhshiansohi, O. Bondu, S. Brochet, G. Bruno, C. Caputo, P. David, C. Delaere,M. Delcourt, A. Giammanco, G. Krintiras, V. Lemaitre, A. Magitteri, K. Piotrzkowski, A. Saggio,M. Vidal Marono, P. Vischia, S. Wertz, J. Zobec

Centro Brasileiro de Pesquisas Fisicas, Rio de Janeiro, BrazilF.L. Alves, G.A. Alves, M. Correa Martins Junior, G. Correia Silva, C. Hensel, A. Moraes,M.E. Pol, P. Rebello Teles

Universidade do Estado do Rio de Janeiro, Rio de Janeiro, BrazilE. Belchior Batista Das Chagas, W. Carvalho, J. Chinellato3, E. Coelho, E.M. Da Costa,G.G. Da Silveira4, D. De Jesus Damiao, C. De Oliveira Martins, S. Fonseca De Souza,H. Malbouisson, D. Matos Figueiredo, M. Melo De Almeida, C. Mora Herrera, L. Mundim,H. Nogima, W.L. Prado Da Silva, L.J. Sanchez Rosas, A. Santoro, A. Sznajder, M. Thiel,E.J. Tonelli Manganote3, F. Torres Da Silva De Araujo, A. Vilela Pereira

Universidade Estadual Paulista a, Universidade Federal do ABC b, Sao Paulo, BrazilS. Ahujaa, C.A. Bernardesa, L. Calligarisa, T.R. Fernandez Perez Tomeia, E.M. Gregoresb,P.G. Mercadanteb, S.F. Novaesa, SandraS. Padulaa

Institute for Nuclear Research and Nuclear Energy, Bulgarian Academy of Sciences, Sofia,

18

BulgariaA. Aleksandrov, R. Hadjiiska, P. Iaydjiev, A. Marinov, M. Misheva, M. Rodozov, M. Shopova,G. Sultanov

University of Sofia, Sofia, BulgariaA. Dimitrov, L. Litov, B. Pavlov, P. Petkov

Beihang University, Beijing, ChinaW. Fang5, X. Gao5, L. Yuan

Institute of High Energy Physics, Beijing, ChinaM. Ahmad, J.G. Bian, G.M. Chen, H.S. Chen, M. Chen, Y. Chen, C.H. Jiang, D. Leggat, H. Liao,Z. Liu, S.M. Shaheen6, A. Spiezia, J. Tao, Z. Wang, E. Yazgan, H. Zhang, S. Zhang6, J. Zhao

State Key Laboratory of Nuclear Physics and Technology, Peking University, Beijing, ChinaY. Ban, G. Chen, A. Levin, J. Li, L. Li, Q. Li, Y. Mao, S.J. Qian, D. Wang

Tsinghua University, Beijing, ChinaY. Wang

Universidad de Los Andes, Bogota, ColombiaC. Avila, A. Cabrera, C.A. Carrillo Montoya, L.F. Chaparro Sierra, C. Florez,C.F. Gonzalez Hernandez, M.A. Segura Delgado

University of Split, Faculty of Electrical Engineering, Mechanical Engineering and NavalArchitecture, Split, CroatiaB. Courbon, N. Godinovic, D. Lelas, I. Puljak, T. Sculac

University of Split, Faculty of Science, Split, CroatiaZ. Antunovic, M. Kovac

Institute Rudjer Boskovic, Zagreb, CroatiaV. Brigljevic, D. Ferencek, K. Kadija, B. Mesic, M. Roguljic, A. Starodumov7, T. Susa

University of Cyprus, Nicosia, CyprusM.W. Ather, A. Attikis, M. Kolosova, G. Mavromanolakis, J. Mousa, C. Nicolaou, F. Ptochos,P.A. Razis, H. Rykaczewski

Charles University, Prague, Czech RepublicM. Finger8, M. Finger Jr.8

Escuela Politecnica Nacional, Quito, EcuadorE. Ayala

Universidad San Francisco de Quito, Quito, EcuadorE. Carrera Jarrin

Academy of Scientific Research and Technology of the Arab Republic of Egypt, EgyptianNetwork of High Energy Physics, Cairo, EgyptH. Abdalla9, A.A. Abdelalim10,11, M.A. Mahmoud12,13

National Institute of Chemical Physics and Biophysics, Tallinn, EstoniaS. Bhowmik, A. Carvalho Antunes De Oliveira, R.K. Dewanjee, K. Ehataht, M. Kadastik,M. Raidal, C. Veelken

Department of Physics, University of Helsinki, Helsinki, FinlandP. Eerola, H. Kirschenmann, J. Pekkanen, M. Voutilainen

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Helsinki Institute of Physics, Helsinki, FinlandJ. Havukainen, J.K. Heikkila, T. Jarvinen, V. Karimaki, R. Kinnunen, T. Lampen, K. Lassila-Perini, S. Laurila, S. Lehti, T. Linden, P. Luukka, T. Maenpaa, H. Siikonen, E. Tuominen,J. Tuominiemi

Lappeenranta University of Technology, Lappeenranta, FinlandT. Tuuva

IRFU, CEA, Universite Paris-Saclay, Gif-sur-Yvette, FranceM. Besancon, F. Couderc, M. Dejardin, D. Denegri, J.L. Faure, F. Ferri, S. Ganjour, A. Givernaud,P. Gras, G. Hamel de Monchenault, P. Jarry, C. Leloup, E. Locci, J. Malcles, G. Negro, J. Rander,A. Rosowsky, M.O. Sahin, M. Titov

Laboratoire Leprince-Ringuet, Ecole polytechnique, CNRS/IN2P3, Universite Paris-Saclay,Palaiseau, FranceA. Abdulsalam14, C. Amendola, I. Antropov, F. Beaudette, P. Busson, C. Charlot,R. Granier de Cassagnac, I. Kucher, A. Lobanov, J. Martin Blanco, C. Martin Perez, M. Nguyen,C. Ochando, G. Ortona, P. Paganini, P. Pigard, J. Rembser, R. Salerno, J.B. Sauvan, Y. Sirois,A.G. Stahl Leiton, A. Zabi, A. Zghiche

Universite de Strasbourg, CNRS, IPHC UMR 7178, Strasbourg, FranceJ.-L. Agram15, J. Andrea, D. Bloch, J.-M. Brom, E.C. Chabert, V. Cherepanov, C. Collard,E. Conte15, J.-C. Fontaine15, D. Gele, U. Goerlach, M. Jansova, A.-C. Le Bihan, N. Tonon,P. Van Hove

Centre de Calcul de l’Institut National de Physique Nucleaire et de Physique des Particules,CNRS/IN2P3, Villeurbanne, FranceS. Gadrat

Universite de Lyon, Universite Claude Bernard Lyon 1, CNRS-IN2P3, Institut de PhysiqueNucleaire de Lyon, Villeurbanne, FranceS. Beauceron, C. Bernet, G. Boudoul, N. Chanon, R. Chierici, D. Contardo, P. Depasse,H. El Mamouni, J. Fay, L. Finco, S. Gascon, M. Gouzevitch, G. Grenier, B. Ille, F. Lagarde,I.B. Laktineh, H. Lattaud, M. Lethuillier, L. Mirabito, S. Perries, A. Popov16, V. Sordini,G. Touquet, M. Vander Donckt, S. Viret

Georgian Technical University, Tbilisi, GeorgiaA. Khvedelidze8

Tbilisi State University, Tbilisi, GeorgiaZ. Tsamalaidze8

RWTH Aachen University, I. Physikalisches Institut, Aachen, GermanyC. Autermann, L. Feld, M.K. Kiesel, K. Klein, M. Lipinski, M. Preuten, M.P. Rauch,C. Schomakers, J. Schulz, M. Teroerde, B. Wittmer

RWTH Aachen University, III. Physikalisches Institut A, Aachen, GermanyA. Albert, D. Duchardt, M. Erdmann, S. Erdweg, T. Esch, R. Fischer, S. Ghosh, A. Guth,T. Hebbeker, C. Heidemann, K. Hoepfner, H. Keller, L. Mastrolorenzo, M. Merschmeyer,A. Meyer, P. Millet, S. Mukherjee, T. Pook, M. Radziej, H. Reithler, M. Rieger, A. Schmidt,D. Teyssier, S. Thuer

RWTH Aachen University, III. Physikalisches Institut B, Aachen, GermanyG. Flugge, O. Hlushchenko, T. Kress, T. Muller, A. Nehrkorn, A. Nowack, C. Pistone, O. Pooth,D. Roy, H. Sert, A. Stahl17

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Deutsches Elektronen-Synchrotron, Hamburg, GermanyM. Aldaya Martin, T. Arndt, C. Asawatangtrakuldee, I. Babounikau, K. Beernaert, O. Behnke,U. Behrens, A. Bermudez Martınez, D. Bertsche, A.A. Bin Anuar, K. Borras18, V. Botta,A. Campbell, P. Connor, C. Contreras-Campana, V. Danilov, A. De Wit, M.M. Defranchis,C. Diez Pardos, D. Domınguez Damiani, G. Eckerlin, T. Eichhorn, A. Elwood, E. Eren,E. Gallo19, A. Geiser, J.M. Grados Luyando, A. Grohsjean, M. Guthoff, M. Haranko, A. Harb,H. Jung, M. Kasemann, J. Keaveney, C. Kleinwort, J. Knolle, D. Krucker, W. Lange, A. Lelek,T. Lenz, J. Leonard, K. Lipka, W. Lohmann20, R. Mankel, I.-A. Melzer-Pellmann, A.B. Meyer,M. Meyer, M. Missiroli, J. Mnich, V. Myronenko, S.K. Pflitsch, D. Pitzl, A. Raspereza, P. Saxena,P. Schutze, C. Schwanenberger, R. Shevchenko, A. Singh, H. Tholen, O. Turkot, A. Vagnerini,G.P. Van Onsem, R. Walsh, Y. Wen, K. Wichmann, C. Wissing, O. Zenaiev

University of Hamburg, Hamburg, GermanyR. Aggleton, S. Bein, L. Benato, A. Benecke, V. Blobel, T. Dreyer, A. Ebrahimi, E. Garutti,D. Gonzalez, P. Gunnellini, J. Haller, A. Hinzmann, A. Karavdina, G. Kasieczka, R. Klanner,R. Kogler, N. Kovalchuk, S. Kurz, V. Kutzner, J. Lange, D. Marconi, J. Multhaup, M. Niedziela,C.E.N. Niemeyer, D. Nowatschin, A. Perieanu, A. Reimers, O. Rieger, C. Scharf, P. Schleper,S. Schumann, J. Schwandt, J. Sonneveld, H. Stadie, G. Steinbruck, F.M. Stober, M. Stover,B. Vormwald, I. Zoi

Karlsruher Institut fuer Technologie, Karlsruhe, GermanyM. Akbiyik, C. Barth, M. Baselga, S. Baur, E. Butz, R. Caspart, T. Chwalek, F. Colombo,W. De Boer, A. Dierlamm, K. El Morabit, N. Faltermann, B. Freund, M. Giffels,M.A. Harrendorf, F. Hartmann17, S.M. Heindl, U. Husemann, I. Katkov16, S. Kudella, S. Mitra,M.U. Mozer, Th. Muller, M. Musich, M. Plagge, G. Quast, K. Rabbertz, M. Schroder, I. Shvetsov,H.J. Simonis, R. Ulrich, S. Wayand, M. Weber, T. Weiler, C. Wohrmann, R. Wolf

Institute of Nuclear and Particle Physics (INPP), NCSR Demokritos, Aghia Paraskevi,GreeceG. Anagnostou, G. Daskalakis, T. Geralis, A. Kyriakis, D. Loukas, G. Paspalaki

National and Kapodistrian University of Athens, Athens, GreeceA. Agapitos, G. Karathanasis, P. Kontaxakis, A. Panagiotou, I. Papavergou, N. Saoulidou,E. Tziaferi, K. Vellidis

National Technical University of Athens, Athens, GreeceK. Kousouris, I. Papakrivopoulos, G. Tsipolitis

University of Ioannina, Ioannina, GreeceI. Evangelou, C. Foudas, P. Gianneios, P. Katsoulis, P. Kokkas, S. Mallios, N. Manthos,I. Papadopoulos, E. Paradas, J. Strologas, F.A. Triantis, D. Tsitsonis

MTA-ELTE Lendulet CMS Particle and Nuclear Physics Group, Eotvos Lorand University,Budapest, HungaryM. Bartok21, M. Csanad, N. Filipovic, P. Major, M.I. Nagy, G. Pasztor, O. Suranyi, G.I. Veres

Wigner Research Centre for Physics, Budapest, HungaryG. Bencze, C. Hajdu, D. Horvath22, A. Hunyadi, F. Sikler, T.A. Vami, V. Veszpremi,G. Vesztergombi†

Institute of Nuclear Research ATOMKI, Debrecen, HungaryN. Beni, S. Czellar, J. Karancsi21, A. Makovec, J. Molnar, Z. Szillasi

21

Institute of Physics, University of Debrecen, Debrecen, HungaryP. Raics, Z.L. Trocsanyi, B. Ujvari

Indian Institute of Science (IISc), Bangalore, IndiaS. Choudhury, J.R. Komaragiri, P.C. Tiwari

National Institute of Science Education and Research, HBNI, Bhubaneswar, IndiaS. Bahinipati24, C. Kar, P. Mal, K. Mandal, A. Nayak25, S. Roy Chowdhury, D.K. Sahoo24,S.K. Swain

Panjab University, Chandigarh, IndiaS. Bansal, S.B. Beri, V. Bhatnagar, S. Chauhan, R. Chawla, N. Dhingra, R. Gupta, A. Kaur,M. Kaur, S. Kaur, P. Kumari, M. Lohan, M. Meena, A. Mehta, K. Sandeep, S. Sharma, J.B. Singh,A.K. Virdi, G. Walia

University of Delhi, Delhi, IndiaA. Bhardwaj, B.C. Choudhary, R.B. Garg, M. Gola, S. Keshri, Ashok Kumar, S. Malhotra,M. Naimuddin, P. Priyanka, K. Ranjan, Aashaq Shah, R. Sharma

Saha Institute of Nuclear Physics, HBNI, Kolkata, IndiaR. Bhardwaj26, M. Bharti26, R. Bhattacharya, S. Bhattacharya, U. Bhawandeep26, D. Bhowmik,S. Dey, S. Dutt26, S. Dutta, S. Ghosh, K. Mondal, S. Nandan, A. Purohit, P.K. Rout, A. Roy,G. Saha, S. Sarkar, M. Sharan, B. Singh26, S. Thakur26

Indian Institute of Technology Madras, Madras, IndiaP.K. Behera, A. Muhammad

Bhabha Atomic Research Centre, Mumbai, IndiaR. Chudasama, D. Dutta, V. Jha, V. Kumar, D.K. Mishra, P.K. Netrakanti, L.M. Pant, P. Shukla,P. Suggisetti

Tata Institute of Fundamental Research-A, Mumbai, IndiaT. Aziz, M.A. Bhat, S. Dugad, G.B. Mohanty, N. Sur, RavindraKumar Verma

Tata Institute of Fundamental Research-B, Mumbai, IndiaS. Banerjee, S. Bhattacharya, S. Chatterjee, P. Das, M. Guchait, Sa. Jain, S. Karmakar, S. Kumar,M. Maity27, G. Majumder, K. Mazumdar, N. Sahoo, T. Sarkar27

Indian Institute of Science Education and Research (IISER), Pune, IndiaS. Chauhan, S. Dube, V. Hegde, A. Kapoor, K. Kothekar, S. Pandey, A. Rane, A. Rastogi,S. Sharma

Institute for Research in Fundamental Sciences (IPM), Tehran, IranS. Chenarani28, E. Eskandari Tadavani, S.M. Etesami28, M. Khakzad, M. Mohammadi Na-jafabadi, M. Naseri, F. Rezaei Hosseinabadi, B. Safarzadeh29, M. Zeinali

University College Dublin, Dublin, IrelandM. Felcini, M. Grunewald

INFN Sezione di Bari a, Universita di Bari b, Politecnico di Bari c, Bari, ItalyM. Abbresciaa ,b, C. Calabriaa,b, A. Colaleoa, D. Creanzaa ,c, L. Cristellaa ,b, N. De Filippisa,c,M. De Palmaa,b, A. Di Florioa ,b, F. Erricoa,b, L. Fiorea, A. Gelmia ,b, G. Iasellia,c, M. Incea ,b,S. Lezkia ,b, G. Maggia,c, M. Maggia, G. Minielloa,b, S. Mya,b, S. Nuzzoa ,b, A. Pompilia ,b,G. Pugliesea ,c, R. Radognaa, A. Ranieria, G. Selvaggia ,b, A. Sharmaa, L. Silvestrisa, R. Vendittia,P. Verwilligena

22

INFN Sezione di Bologna a, Universita di Bologna b, Bologna, ItalyG. Abbiendia, C. Battilanaa,b, D. Bonacorsia,b, L. Borgonovia,b, S. Braibant-Giacomellia ,b,R. Campaninia ,b, P. Capiluppia,b, A. Castroa ,b, F.R. Cavalloa, S.S. Chhibraa,b, G. Codispotia ,b,M. Cuffiania ,b, G.M. Dallavallea, F. Fabbria, A. Fanfania,b, E. Fontanesi, P. Giacomellia,C. Grandia, L. Guiduccia,b, F. Iemmia,b, S. Lo Meoa,30, S. Marcellinia, G. Masettia, A. Montanaria,F.L. Navarriaa,b, A. Perrottaa, F. Primaveraa ,b, A.M. Rossia ,b, T. Rovellia ,b, G.P. Sirolia,b, N. Tosia

INFN Sezione di Catania a, Universita di Catania b, Catania, ItalyS. Albergoa,b, A. Di Mattiaa, R. Potenzaa,b, A. Tricomia,b, C. Tuvea ,b

INFN Sezione di Firenze a, Universita di Firenze b, Firenze, ItalyG. Barbaglia, K. Chatterjeea ,b, V. Ciullia,b, C. Civininia, R. D’Alessandroa,b, E. Focardia ,b,G. Latino, P. Lenzia,b, M. Meschinia, S. Paolettia, L. Russoa ,31, G. Sguazzonia, D. Stroma,L. Viliania

INFN Laboratori Nazionali di Frascati, Frascati, ItalyL. Benussi, S. Bianco, F. Fabbri, D. Piccolo

INFN Sezione di Genova a, Universita di Genova b, Genova, ItalyF. Ferroa, R. Mulargiaa,b, F. Raveraa,b, E. Robuttia, S. Tosia,b

INFN Sezione di Milano-Bicocca a, Universita di Milano-Bicocca b, Milano, ItalyA. Benagliaa, A. Beschib, F. Brivioa,b, V. Cirioloa,b ,17, S. Di Guidaa ,b ,17, M.E. Dinardoa ,b,S. Fiorendia,b, S. Gennaia, A. Ghezzia,b, P. Govonia,b, M. Malbertia ,b, S. Malvezzia, D. Menascea,F. Monti, L. Moronia, M. Paganonia ,b, D. Pedrinia, S. Ragazzia ,b, T. Tabarelli de Fatisa ,b,D. Zuoloa ,b

INFN Sezione di Napoli a, Universita di Napoli ’Federico II’ b, Napoli, Italy, Universita dellaBasilicata c, Potenza, Italy, Universita G. Marconi d, Roma, ItalyS. Buontempoa, N. Cavalloa,c, A. De Iorioa,b, A. Di Crescenzoa,b, F. Fabozzia,c, F. Fiengaa,G. Galatia, A.O.M. Iorioa ,b, W.A. Khana, L. Listaa, S. Meolaa ,d ,17, P. Paoluccia ,17, C. Sciaccaa ,b,E. Voevodinaa ,b

INFN Sezione di Padova a, Universita di Padova b, Padova, Italy, Universita di Trento c,Trento, ItalyP. Azzia, N. Bacchettaa, D. Biselloa ,b, A. Bolettia ,b, A. Bragagnolo, R. Carlina ,b, P. Checchiaa,M. Dall’Ossoa ,b, P. De Castro Manzanoa, T. Dorigoa, U. Dossellia, F. Gasparinia ,b,U. Gasparinia ,b, A. Gozzelinoa, S.Y. Hoh, S. Lacapraraa, P. Lujan, M. Margonia ,b,A.T. Meneguzzoa,b, J. Pazzinia ,b, M. Presillab, P. Ronchesea,b, R. Rossina ,b, F. Simonettoa ,b,A. Tiko, E. Torassaa, M. Tosia,b, M. Zanettia ,b, P. Zottoa ,b, G. Zumerlea,b

INFN Sezione di Pavia a, Universita di Pavia b, Pavia, ItalyA. Braghieria, A. Magnania, P. Montagnaa,b, S.P. Rattia,b, V. Rea, M. Ressegottia,b, C. Riccardia ,b,P. Salvinia, I. Vaia,b, P. Vituloa ,b

INFN Sezione di Perugia a, Universita di Perugia b, Perugia, ItalyM. Biasinia,b, G.M. Bileia, C. Cecchia,b, D. Ciangottinia ,b, L. Fanoa,b, P. Laricciaa,b, R. Leonardia ,b,E. Manonia, G. Mantovania,b, V. Mariania,b, M. Menichellia, A. Rossia,b, A. Santocchiaa ,b,D. Spigaa

INFN Sezione di Pisa a, Universita di Pisa b, Scuola Normale Superiore di Pisa c, Pisa, ItalyK. Androsova, P. Azzurria, G. Bagliesia, L. Bianchinia, T. Boccalia, L. Borrello, R. Castaldia,M.A. Cioccia ,b, R. Dell’Orsoa, G. Fedia, F. Fioria ,c, L. Gianninia ,c, A. Giassia, M.T. Grippoa,

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F. Ligabuea,c, E. Mancaa ,c, G. Mandorlia,c, A. Messineoa,b, F. Pallaa, A. Rizzia,b, G. Rolandi32,P. Spagnoloa, R. Tenchinia, G. Tonellia ,b, A. Venturia, P.G. Verdinia

INFN Sezione di Roma a, Sapienza Universita di Roma b, Rome, ItalyL. Baronea ,b, F. Cavallaria, M. Cipriania,b, D. Del Rea ,b, E. Di Marcoa,b, M. Diemoza, S. Gellia ,b,E. Longoa ,b, B. Marzocchia ,b, P. Meridiania, G. Organtinia,b, F. Pandolfia, R. Paramattia ,b,F. Preiatoa ,b, S. Rahatloua ,b, C. Rovellia, F. Santanastasioa ,b

INFN Sezione di Torino a, Universita di Torino b, Torino, Italy, Universita del PiemonteOrientale c, Novara, ItalyN. Amapanea,b, R. Arcidiaconoa,c, S. Argiroa,b, M. Arneodoa,c, N. Bartosika, R. Bellana ,b,C. Biinoa, A. Cappatia,b, N. Cartigliaa, F. Cennaa ,b, S. Comettia, M. Costaa ,b, R. Covarellia ,b,N. Demariaa, B. Kiania,b, C. Mariottia, S. Masellia, E. Migliorea,b, V. Monacoa ,b,E. Monteila ,b, M. Montenoa, M.M. Obertinoa ,b, L. Pachera ,b, N. Pastronea, M. Pelliccionia,G.L. Pinna Angionia ,b, A. Romeroa ,b, M. Ruspaa ,c, R. Sacchia,b, R. Salvaticoa ,b, K. Shchelinaa ,b,V. Solaa, A. Solanoa,b, D. Soldia ,b, A. Staianoa

INFN Sezione di Trieste a, Universita di Trieste b, Trieste, ItalyS. Belfortea, V. Candelisea,b, M. Casarsaa, F. Cossuttia, A. Da Rolda ,b, G. Della Riccaa ,b,F. Vazzolera,b, A. Zanettia

Kyungpook National University, Daegu, KoreaD.H. Kim, G.N. Kim, M.S. Kim, J. Lee, S. Lee, S.W. Lee, C.S. Moon, Y.D. Oh, S.I. Pak, S. Sekmen,D.C. Son, Y.C. Yang

Chonnam National University, Institute for Universe and Elementary Particles, Kwangju,KoreaH. Kim, D.H. Moon, G. Oh

Hanyang University, Seoul, KoreaB. Francois, J. Goh33, T.J. Kim

Korea University, Seoul, KoreaS. Cho, S. Choi, Y. Go, D. Gyun, S. Ha, B. Hong, Y. Jo, K. Lee, K.S. Lee, S. Lee, J. Lim, S.K. Park,Y. Roh

Sejong University, Seoul, KoreaH.S. Kim

Seoul National University, Seoul, KoreaJ. Almond, J. Kim, J.S. Kim, H. Lee, K. Lee, K. Nam, S.B. Oh, B.C. Radburn-Smith, S.h. Seo,U.K. Yang, H.D. Yoo, G.B. Yu

University of Seoul, Seoul, KoreaD. Jeon, H. Kim, J.H. Kim, J.S.H. Lee, I.C. Park

Sungkyunkwan University, Suwon, KoreaY. Choi, C. Hwang, J. Lee, I. Yu

Vilnius University, Vilnius, LithuaniaV. Dudenas, A. Juodagalvis, J. Vaitkus

National Centre for Particle Physics, Universiti Malaya, Kuala Lumpur, MalaysiaZ.A. Ibrahim, M.A.B. Md Ali34, F. Mohamad Idris35, W.A.T. Wan Abdullah, M.N. Yusli,Z. Zolkapli

24

Universidad de Sonora (UNISON), Hermosillo, MexicoJ.F. Benitez, A. Castaneda Hernandez, J.A. Murillo Quijada

Centro de Investigacion y de Estudios Avanzados del IPN, Mexico City, MexicoH. Castilla-Valdez, E. De La Cruz-Burelo, M.C. Duran-Osuna, I. Heredia-De La Cruz36,R. Lopez-Fernandez, J. Mejia Guisao, R.I. Rabadan-Trejo, M. Ramirez-Garcia, G. Ramirez-Sanchez, R. Reyes-Almanza, A. Sanchez-Hernandez

Universidad Iberoamericana, Mexico City, MexicoS. Carrillo Moreno, C. Oropeza Barrera, F. Vazquez Valencia

Benemerita Universidad Autonoma de Puebla, Puebla, MexicoJ. Eysermans, I. Pedraza, H.A. Salazar Ibarguen, C. Uribe Estrada

Universidad Autonoma de San Luis Potosı, San Luis Potosı, MexicoA. Morelos Pineda

University of Auckland, Auckland, New ZealandD. Krofcheck

University of Canterbury, Christchurch, New ZealandS. Bheesette, P.H. Butler

National Centre for Physics, Quaid-I-Azam University, Islamabad, PakistanA. Ahmad, M. Ahmad, M.I. Asghar, Q. Hassan, H.R. Hoorani, A. Saddique, M.A. Shah,M. Shoaib, M. Waqas

National Centre for Nuclear Research, Swierk, PolandH. Bialkowska, M. Bluj, B. Boimska, T. Frueboes, M. Gorski, M. Kazana, M. Szleper, P. Traczyk,P. Zalewski

Institute of Experimental Physics, Faculty of Physics, University of Warsaw, Warsaw, PolandK. Bunkowski, A. Byszuk37, K. Doroba, A. Kalinowski, M. Konecki, J. Krolikowski, M. Misiura,M. Olszewski, A. Pyskir, M. Walczak

Laboratorio de Instrumentacao e Fısica Experimental de Partıculas, Lisboa, PortugalM. Araujo, P. Bargassa, C. Beirao Da Cruz E Silva, A. Di Francesco, P. Faccioli, B. Galinhas,M. Gallinaro, J. Hollar, N. Leonardo, J. Seixas, G. Strong, O. Toldaiev, J. Varela

Joint Institute for Nuclear Research, Dubna, RussiaS. Afanasiev, P. Bunin, M. Gavrilenko, I. Golutvin, I. Gorbunov, A. Kamenev, V. Karjavine,A. Lanev, A. Malakhov, V. Matveev38,39, P. Moisenz, V. Palichik, V. Perelygin, S. Shmatov,S. Shulha, N. Skatchkov, V. Smirnov, N. Voytishin, A. Zarubin

Petersburg Nuclear Physics Institute, Gatchina (St. Petersburg), RussiaV. Golovtsov, Y. Ivanov, V. Kim40, E. Kuznetsova41, P. Levchenko, V. Murzin, V. Oreshkin,I. Smirnov, D. Sosnov, V. Sulimov, L. Uvarov, S. Vavilov, A. Vorobyev

Institute for Nuclear Research, Moscow, RussiaYu. Andreev, A. Dermenev, S. Gninenko, N. Golubev, A. Karneyeu, M. Kirsanov, N. Krasnikov,A. Pashenkov, D. Tlisov, A. Toropin

Institute for Theoretical and Experimental Physics, Moscow, RussiaV. Epshteyn, V. Gavrilov, N. Lychkovskaya, V. Popov, I. Pozdnyakov, G. Safronov,A. Spiridonov, A. Stepennov, V. Stolin, M. Toms, E. Vlasov, A. Zhokin

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Moscow Institute of Physics and Technology, Moscow, RussiaT. Aushev

National Research Nuclear University ’Moscow Engineering Physics Institute’ (MEPhI),Moscow, RussiaR. Chistov42, M. Danilov42, P. Parygin, D. Philippov, S. Polikarpov42, E. Tarkovskii

P.N. Lebedev Physical Institute, Moscow, RussiaV. Andreev, M. Azarkin, I. Dremin39, M. Kirakosyan, A. Terkulov

Skobeltsyn Institute of Nuclear Physics, Lomonosov Moscow State University, Moscow,RussiaA. Baskakov, A. Belyaev, E. Boos, M. Dubinin43, L. Dudko, A. Ershov, A. Gribushin,V. Klyukhin, O. Kodolova, I. Lokhtin, I. Miagkov, S. Obraztsov, S. Petrushanko, V. Savrin,A. Snigirev

Novosibirsk State University (NSU), Novosibirsk, RussiaA. Barnyakov44, V. Blinov44, T. Dimova44, L. Kardapoltsev44, Y. Skovpen44

Institute for High Energy Physics of National Research Centre ’Kurchatov Institute’,Protvino, RussiaI. Azhgirey, I. Bayshev, S. Bitioukov, V. Kachanov, A. Kalinin, D. Konstantinov, P. Mandrik,V. Petrov, R. Ryutin, S. Slabospitskii, A. Sobol, S. Troshin, N. Tyurin, A. Uzunian, A. Volkov

National Research Tomsk Polytechnic University, Tomsk, RussiaA. Babaev, S. Baidali, V. Okhotnikov

University of Belgrade, Faculty of Physics and Vinca Institute of Nuclear Sciences, Belgrade,SerbiaP. Adzic45, P. Cirkovic, D. Devetak, M. Dordevic, J. Milosevic

Centro de Investigaciones Energeticas Medioambientales y Tecnologicas (CIEMAT),Madrid, SpainJ. Alcaraz Maestre, A. Alvarez Fernandez, I. Bachiller, M. Barrio Luna, J.A. Brochero Cifuentes,M. Cerrada, N. Colino, B. De La Cruz, A. Delgado Peris, C. Fernandez Bedoya,J.P. Fernandez Ramos, J. Flix, M.C. Fouz, O. Gonzalez Lopez, S. Goy Lopez, J.M. Hernandez,M.I. Josa, D. Moran, A. Perez-Calero Yzquierdo, J. Puerta Pelayo, I. Redondo, L. Romero,S. Sanchez Navas, M.S. Soares, A. Triossi

Universidad Autonoma de Madrid, Madrid, SpainC. Albajar, J.F. de Troconiz

Universidad de Oviedo, Oviedo, SpainJ. Cuevas, C. Erice, J. Fernandez Menendez, S. Folgueras, I. Gonzalez Caballero,J.R. Gonzalez Fernandez, E. Palencia Cortezon, V. Rodrıguez Bouza, S. Sanchez Cruz,J.M. Vizan Garcia

Instituto de Fısica de Cantabria (IFCA), CSIC-Universidad de Cantabria, Santander, SpainI.J. Cabrillo, A. Calderon, B. Chazin Quero, J. Duarte Campderros, M. Fernandez,P.J. Fernandez Manteca, A. Garcıa Alonso, J. Garcia-Ferrero, G. Gomez, A. Lopez Virto,J. Marco, C. Martinez Rivero, P. Martinez Ruiz del Arbol, F. Matorras, J. Piedra Gomez,C. Prieels, T. Rodrigo, A. Ruiz-Jimeno, L. Scodellaro, N. Trevisani, I. Vila, R. Vilar Cortabitarte

University of Ruhuna, Department of Physics, Matara, Sri LankaN. Wickramage

26

CERN, European Organization for Nuclear Research, Geneva, SwitzerlandD. Abbaneo, B. Akgun, E. Auffray, G. Auzinger, P. Baillon, A.H. Ball, D. Barney, J. Bendavid,M. Bianco, A. Bocci, C. Botta, E. Brondolin, T. Camporesi, M. Cepeda, G. Cerminara,E. Chapon, Y. Chen, G. Cucciati, D. d’Enterria, A. Dabrowski, N. Daci, V. Daponte, A. David,A. De Roeck, N. Deelen, M. Dobson, M. Dunser, N. Dupont, A. Elliott-Peisert, P. Everaerts,F. Fallavollita46, D. Fasanella, G. Franzoni, J. Fulcher, W. Funk, D. Gigi, A. Gilbert, K. Gill,F. Glege, M. Gruchala, M. Guilbaud, D. Gulhan, J. Hegeman, C. Heidegger, V. Innocente,A. Jafari, P. Janot, O. Karacheban20, J. Kieseler, A. Kornmayer, M. Krammer1, C. Lange, P. Lecoq,C. Lourenco, L. Malgeri, M. Mannelli, A. Massironi, F. Meijers, J.A. Merlin, S. Mersi, E. Meschi,P. Milenovic47, F. Moortgat, M. Mulders, J. Ngadiuba, S. Nourbakhsh, S. Orfanelli, L. Orsini,F. Pantaleo17, L. Pape, E. Perez, M. Peruzzi, A. Petrilli, G. Petrucciani, A. Pfeiffer, M. Pierini,F.M. Pitters, D. Rabady, A. Racz, T. Reis, M. Rovere, H. Sakulin, C. Schafer, C. Schwick,M. Selvaggi, A. Sharma, P. Silva, P. Sphicas48, A. Stakia, J. Steggemann, D. Treille, A. Tsirou,V. Veckalns49, M. Verzetti, W.D. Zeuner

Paul Scherrer Institut, Villigen, SwitzerlandL. Caminada50, K. Deiters, W. Erdmann, R. Horisberger, Q. Ingram, H.C. Kaestli, D. Kotlinski,U. Langenegger, T. Rohe, S.A. Wiederkehr

ETH Zurich - Institute for Particle Physics and Astrophysics (IPA), Zurich, SwitzerlandM. Backhaus, L. Bani, P. Berger, N. Chernyavskaya, G. Dissertori, M. Dittmar, M. Donega,C. Dorfer, T.A. Gomez Espinosa, C. Grab, D. Hits, T. Klijnsma, W. Lustermann, R.A. Manzoni,M. Marionneau, M.T. Meinhard, F. Micheli, P. Musella, F. Nessi-Tedaldi, F. Pauss, G. Perrin,L. Perrozzi, S. Pigazzini, M. Quittnat, C. Reissel, D. Ruini, D.A. Sanz Becerra, M. Schonenberger,L. Shchutska, V.R. Tavolaro, K. Theofilatos, M.L. Vesterbacka Olsson, R. Wallny, D.H. Zhu

Universitat Zurich, Zurich, SwitzerlandT.K. Aarrestad, C. Amsler51, D. Brzhechko, M.F. Canelli, A. De Cosa, R. Del Burgo, S. Donato,C. Galloni, T. Hreus, B. Kilminster, S. Leontsinis, I. Neutelings, G. Rauco, P. Robmann,K. Schweiger, C. Seitz, Y. Takahashi, A. Zucchetta

National Central University, Chung-Li, TaiwanT.H. Doan, R. Khurana, C.M. Kuo, W. Lin, A. Pozdnyakov, S.S. Yu

National Taiwan University (NTU), Taipei, TaiwanP. Chang, Y. Chao, K.F. Chen, P.H. Chen, W.-S. Hou, Y.F. Liu, R.-S. Lu, E. Paganis, A. Psallidas,A. Steen

Chulalongkorn University, Faculty of Science, Department of Physics, Bangkok, ThailandB. Asavapibhop, N. Srimanobhas, N. Suwonjandee

Cukurova University, Physics Department, Science and Art Faculty, Adana, TurkeyA. Bat, F. Boran, S. Cerci52, S. Damarseckin, Z.S. Demiroglu, F. Dolek, C. Dozen, I. Dumanoglu,G. Gokbulut, Y. Guler, E. Gurpinar, I. Hos53, C. Isik, E.E. Kangal54, O. Kara, A. Kayis Topaksu,U. Kiminsu, M. Oglakci, G. Onengut, K. Ozdemir55, S. Ozturk56, D. Sunar Cerci52, B. Tali52,U.G. Tok, S. Turkcapar, I.S. Zorbakir, C. Zorbilmez

Middle East Technical University, Physics Department, Ankara, TurkeyB. Isildak57, G. Karapinar58, M. Yalvac, M. Zeyrek

Bogazici University, Istanbul, TurkeyI.O. Atakisi, E. Gulmez, M. Kaya59, O. Kaya60, S. Ozkorucuklu61, S. Tekten, E.A. Yetkin62

27

Istanbul Technical University, Istanbul, TurkeyM.N. Agaras, A. Cakir, K. Cankocak, Y. Komurcu, S. Sen63

Institute for Scintillation Materials of National Academy of Science of Ukraine, Kharkov,UkraineB. Grynyov

National Scientific Center, Kharkov Institute of Physics and Technology, Kharkov, UkraineL. Levchuk

University of Bristol, Bristol, United KingdomF. Ball, J.J. Brooke, D. Burns, E. Clement, D. Cussans, O. Davignon, H. Flacher, J. Goldstein,G.P. Heath, H.F. Heath, L. Kreczko, D.M. Newbold64, S. Paramesvaran, B. Penning, T. Sakuma,D. Smith, V.J. Smith, J. Taylor, A. Titterton

Rutherford Appleton Laboratory, Didcot, United KingdomK.W. Bell, A. Belyaev65, C. Brew, R.M. Brown, D. Cieri, D.J.A. Cockerill, J.A. Coughlan,K. Harder, S. Harper, J. Linacre, K. Manolopoulos, E. Olaiya, D. Petyt, C.H. Shepherd-Themistocleous, A. Thea, I.R. Tomalin, T. Williams, W.J. Womersley

Imperial College, London, United KingdomR. Bainbridge, P. Bloch, J. Borg, S. Breeze, O. Buchmuller, A. Bundock, D. Colling, P. Dauncey,G. Davies, M. Della Negra, R. Di Maria, G. Hall, G. Iles, T. James, M. Komm, L. Lyons,A.-M. Magnan, S. Malik, A. Martelli, J. Nash66, A. Nikitenko7, V. Palladino, M. Pesaresi,D.M. Raymond, A. Richards, A. Rose, E. Scott, C. Seez, A. Shtipliyski, G. Singh, M. Stoye,T. Strebler, S. Summers, A. Tapper, K. Uchida, T. Virdee17, N. Wardle, D. Winterbottom,S.C. Zenz

Brunel University, Uxbridge, United KingdomJ.E. Cole, P.R. Hobson, A. Khan, P. Kyberd, C.K. Mackay, A. Morton, I.D. Reid, L. Teodorescu,S. Zahid

Baylor University, Waco, USAK. Call, J. Dittmann, K. Hatakeyama, H. Liu, C. Madrid, B. McMaster, N. Pastika, C. Smith

Catholic University of America, Washington DC, USAR. Bartek, A. Dominguez

The University of Alabama, Tuscaloosa, USAA. Buccilli, S.I. Cooper, C. Henderson, P. Rumerio, C. West

Boston University, Boston, USAD. Arcaro, T. Bose, D. Gastler, S. Girgis, D. Pinna, D. Rankin, C. Richardson, J. Rohlf, L. Sulak,D. Zou

Brown University, Providence, USAG. Benelli, X. Coubez, D. Cutts, M. Hadley, J. Hakala, U. Heintz, J.M. Hogan67, K.H.M. Kwok,E. Laird, G. Landsberg, J. Lee, Z. Mao, M. Narain, S. Sagir68, R. Syarif, E. Usai, D. Yu

University of California, Davis, Davis, USAR. Band, C. Brainerd, R. Breedon, D. Burns, M. Calderon De La Barca Sanchez, M. Chertok,J. Conway, R. Conway, P.T. Cox, R. Erbacher, C. Flores, G. Funk, W. Ko, O. Kukral, R. Lander,M. Mulhearn, D. Pellett, J. Pilot, S. Shalhout, M. Shi, D. Stolp, D. Taylor, K. Tos, M. Tripathi,Z. Wang, F. Zhang

28

University of California, Los Angeles, USAM. Bachtis, C. Bravo, R. Cousins, A. Dasgupta, A. Florent, J. Hauser, M. Ignatenko, N. Mccoll,S. Regnard, D. Saltzberg, C. Schnaible, V. Valuev

University of California, Riverside, Riverside, USAE. Bouvier, K. Burt, R. Clare, J.W. Gary, S.M.A. Ghiasi Shirazi, G. Hanson, G. Karapostoli,E. Kennedy, F. Lacroix, O.R. Long, M. Olmedo Negrete, M.I. Paneva, W. Si, L. Wang, H. Wei,S. Wimpenny, B.R. Yates

University of California, San Diego, La Jolla, USAJ.G. Branson, P. Chang, S. Cittolin, M. Derdzinski, R. Gerosa, D. Gilbert, B. Hashemi,A. Holzner, D. Klein, G. Kole, V. Krutelyov, J. Letts, M. Masciovecchio, D. Olivito, S. Padhi,M. Pieri, M. Sani, V. Sharma, S. Simon, M. Tadel, A. Vartak, S. Wasserbaech69, J. Wood,F. Wurthwein, A. Yagil, G. Zevi Della Porta

University of California, Santa Barbara - Department of Physics, Santa Barbara, USAN. Amin, R. Bhandari, C. Campagnari, M. Citron, V. Dutta, M. Franco Sevilla, L. Gouskos,R. Heller, J. Incandela, H. Mei, A. Ovcharova, H. Qu, J. Richman, D. Stuart, I. Suarez, S. Wang,J. Yoo

California Institute of Technology, Pasadena, USAD. Anderson, A. Bornheim, J.M. Lawhorn, N. Lu, H.B. Newman, T.Q. Nguyen, J. Pata,M. Spiropulu, J.R. Vlimant, R. Wilkinson, S. Xie, Z. Zhang, R.Y. Zhu

Carnegie Mellon University, Pittsburgh, USAM.B. Andrews, T. Ferguson, T. Mudholkar, M. Paulini, M. Sun, I. Vorobiev, M. Weinberg

University of Colorado Boulder, Boulder, USAJ.P. Cumalat, W.T. Ford, F. Jensen, A. Johnson, E. MacDonald, T. Mulholland, R. Patel, A. Perloff,K. Stenson, K.A. Ulmer, S.R. Wagner

Cornell University, Ithaca, USAJ. Alexander, J. Chaves, Y. Cheng, J. Chu, A. Datta, K. Mcdermott, N. Mirman, J.R. Patterson,D. Quach, A. Rinkevicius, A. Ryd, L. Skinnari, L. Soffi, S.M. Tan, Z. Tao, J. Thom, J. Tucker,P. Wittich, M. Zientek

Fermi National Accelerator Laboratory, Batavia, USAS. Abdullin, M. Albrow, M. Alyari, G. Apollinari, A. Apresyan, A. Apyan, S. Banerjee,L.A.T. Bauerdick, A. Beretvas, J. Berryhill, P.C. Bhat, K. Burkett, J.N. Butler, A. Canepa,G.B. Cerati, H.W.K. Cheung, F. Chlebana, M. Cremonesi, J. Duarte, V.D. Elvira, J. Freeman,Z. Gecse, E. Gottschalk, L. Gray, D. Green, S. Grunendahl, O. Gutsche, J. Hanlon, R.M. Harris,S. Hasegawa, J. Hirschauer, Z. Hu, B. Jayatilaka, S. Jindariani, M. Johnson, U. Joshi, B. Klima,M.J. Kortelainen, B. Kreis, S. Lammel, D. Lincoln, R. Lipton, M. Liu, T. Liu, J. Lykken,K. Maeshima, J.M. Marraffino, D. Mason, P. McBride, P. Merkel, S. Mrenna, S. Nahn, V. O’Dell,K. Pedro, C. Pena, O. Prokofyev, G. Rakness, L. Ristori, A. Savoy-Navarro70, B. Schneider,E. Sexton-Kennedy, A. Soha, W.J. Spalding, L. Spiegel, S. Stoynev, J. Strait, N. Strobbe, L. Taylor,S. Tkaczyk, N.V. Tran, L. Uplegger, E.W. Vaandering, C. Vernieri, M. Verzocchi, R. Vidal,M. Wang, H.A. Weber, A. Whitbeck

University of Florida, Gainesville, USAD. Acosta, P. Avery, P. Bortignon, D. Bourilkov, A. Brinkerhoff, L. Cadamuro, A. Carnes,D. Curry, R.D. Field, S.V. Gleyzer, B.M. Joshi, J. Konigsberg, A. Korytov, K.H. Lo, P. Ma,K. Matchev, G. Mitselmakher, D. Rosenzweig, K. Shi, D. Sperka, J. Wang, S. Wang, X. Zuo

29

Florida International University, Miami, USAY.R. Joshi, S. Linn

Florida State University, Tallahassee, USAA. Ackert, T. Adams, A. Askew, S. Hagopian, V. Hagopian, K.F. Johnson, T. Kolberg,G. Martinez, T. Perry, H. Prosper, A. Saha, C. Schiber, R. Yohay

Florida Institute of Technology, Melbourne, USAM.M. Baarmand, V. Bhopatkar, S. Colafranceschi, M. Hohlmann, D. Noonan, M. Rahmani,T. Roy, F. Yumiceva

University of Illinois at Chicago (UIC), Chicago, USAM.R. Adams, L. Apanasevich, D. Berry, R.R. Betts, R. Cavanaugh, X. Chen, S. Dittmer,O. Evdokimov, C.E. Gerber, D.A. Hangal, D.J. Hofman, K. Jung, J. Kamin, C. Mills, M.B. Tonjes,N. Varelas, H. Wang, X. Wang, Z. Wu, J. Zhang

The University of Iowa, Iowa City, USAM. Alhusseini, B. Bilki71, W. Clarida, K. Dilsiz72, S. Durgut, R.P. Gandrajula, M. Haytmyradov,V. Khristenko, J.-P. Merlo, A. Mestvirishvili, A. Moeller, J. Nachtman, H. Ogul73, Y. Onel,F. Ozok74, A. Penzo, C. Snyder, E. Tiras, J. Wetzel

Johns Hopkins University, Baltimore, USAB. Blumenfeld, A. Cocoros, N. Eminizer, D. Fehling, L. Feng, A.V. Gritsan, W.T. Hung,P. Maksimovic, J. Roskes, U. Sarica, M. Swartz, M. Xiao, C. You

The University of Kansas, Lawrence, USAA. Al-bataineh, P. Baringer, A. Bean, S. Boren, J. Bowen, A. Bylinkin, J. Castle, S. Khalil,A. Kropivnitskaya, D. Majumder, W. Mcbrayer, M. Murray, C. Rogan, S. Sanders, E. Schmitz,J.D. Tapia Takaki, Q. Wang

Kansas State University, Manhattan, USAS. Duric, A. Ivanov, K. Kaadze, D. Kim, Y. Maravin, D.R. Mendis, T. Mitchell, A. Modak,A. Mohammadi

Lawrence Livermore National Laboratory, Livermore, USAF. Rebassoo, D. Wright

University of Maryland, College Park, USAA. Baden, O. Baron, A. Belloni, S.C. Eno, Y. Feng, C. Ferraioli, N.J. Hadley, S. Jabeen, G.Y. Jeng,R.G. Kellogg, J. Kunkle, A.C. Mignerey, S. Nabili, F. Ricci-Tam, M. Seidel, Y.H. Shin, A. Skuja,S.C. Tonwar, K. Wong

Massachusetts Institute of Technology, Cambridge, USAD. Abercrombie, B. Allen, V. Azzolini, A. Baty, G. Bauer, R. Bi, S. Brandt, W. Busza, I.A. Cali,M. D’Alfonso, Z. Demiragli, G. Gomez Ceballos, M. Goncharov, P. Harris, D. Hsu, M. Hu,Y. Iiyama, G.M. Innocenti, M. Klute, D. Kovalskyi, Y.-J. Lee, P.D. Luckey, B. Maier, A.C. Marini,C. Mcginn, C. Mironov, S. Narayanan, X. Niu, C. Paus, C. Roland, G. Roland, Z. Shi,G.S.F. Stephans, K. Sumorok, K. Tatar, D. Velicanu, J. Wang, T.W. Wang, B. Wyslouch

University of Minnesota, Minneapolis, USAA.C. Benvenuti†, R.M. Chatterjee, A. Evans, P. Hansen, J. Hiltbrand, Sh. Jain, S. Kalafut,M. Krohn, Y. Kubota, Z. Lesko, J. Mans, N. Ruckstuhl, R. Rusack, M.A. Wadud

University of Mississippi, Oxford, USAJ.G. Acosta, S. Oliveros

30

University of Nebraska-Lincoln, Lincoln, USAE. Avdeeva, K. Bloom, D.R. Claes, C. Fangmeier, F. Golf, R. Gonzalez Suarez, R. Kamalieddin,I. Kravchenko, J. Monroy, J.E. Siado, G.R. Snow, B. Stieger

State University of New York at Buffalo, Buffalo, USAA. Godshalk, C. Harrington, I. Iashvili, A. Kharchilava, C. Mclean, D. Nguyen, A. Parker,S. Rappoccio, B. Roozbahani

Northeastern University, Boston, USAG. Alverson, E. Barberis, C. Freer, Y. Haddad, A. Hortiangtham, D.M. Morse, T. Orimoto,T. Wamorkar, B. Wang, A. Wisecarver, D. Wood

Northwestern University, Evanston, USAS. Bhattacharya, J. Bueghly, O. Charaf, T. Gunter, K.A. Hahn, N. Odell, M.H. Schmitt, K. Sung,M. Trovato, M. Velasco

University of Notre Dame, Notre Dame, USAR. Bucci, N. Dev, M. Hildreth, K. Hurtado Anampa, C. Jessop, D.J. Karmgard, K. Lannon, W. Li,N. Loukas, N. Marinelli, F. Meng, C. Mueller, Y. Musienko38, M. Planer, A. Reinsvold, R. Ruchti,P. Siddireddy, G. Smith, S. Taroni, M. Wayne, A. Wightman, M. Wolf, A. Woodard

The Ohio State University, Columbus, USAJ. Alimena, L. Antonelli, B. Bylsma, L.S. Durkin, S. Flowers, B. Francis, C. Hill, W. Ji, T.Y. Ling,W. Luo, B.L. Winer

Princeton University, Princeton, USAS. Cooperstein, P. Elmer, J. Hardenbrook, N. Haubrich, S. Higginbotham, A. Kalogeropoulos,S. Kwan, D. Lange, M.T. Lucchini, J. Luo, D. Marlow, K. Mei, I. Ojalvo, J. Olsen, C. Palmer,P. Piroue, J. Salfeld-Nebgen, D. Stickland, C. Tully

University of Puerto Rico, Mayaguez, USAS. Malik, S. Norberg

Purdue University, West Lafayette, USAA. Barker, V.E. Barnes, S. Das, L. Gutay, M. Jones, A.W. Jung, A. Khatiwada, B. Mahakud,D.H. Miller, N. Neumeister, C.C. Peng, S. Piperov, H. Qiu, J.F. Schulte, J. Sun, F. Wang, R. Xiao,W. Xie

Purdue University Northwest, Hammond, USAT. Cheng, J. Dolen, N. Parashar

Rice University, Houston, USAZ. Chen, K.M. Ecklund, S. Freed, F.J.M. Geurts, M. Kilpatrick, Arun Kumar, W. Li, B.P. Padley,R. Redjimi, J. Roberts, J. Rorie, W. Shi, Z. Tu, A. Zhang

University of Rochester, Rochester, USAA. Bodek, P. de Barbaro, R. Demina, Y.t. Duh, J.L. Dulemba, C. Fallon, T. Ferbel, M. Galanti,A. Garcia-Bellido, J. Han, O. Hindrichs, A. Khukhunaishvili, E. Ranken, P. Tan, R. Taus

Rutgers, The State University of New Jersey, Piscataway, USAB. Chiarito, J.P. Chou, Y. Gershtein, E. Halkiadakis, A. Hart, M. Heindl, E. Hughes, S. Kaplan,R. Kunnawalkam Elayavalli, S. Kyriacou, I. Laflotte, A. Lath, R. Montalvo, K. Nash,M. Osherson, H. Saka, S. Salur, S. Schnetzer, D. Sheffield, S. Somalwar, R. Stone, S. Thomas,P. Thomassen

31

University of Tennessee, Knoxville, USAA.G. Delannoy, J. Heideman, G. Riley, S. Spanier

Texas A&M University, College Station, USAO. Bouhali75, A. Celik, M. Dalchenko, M. De Mattia, A. Delgado, S. Dildick, R. Eusebi,J. Gilmore, T. Huang, T. Kamon76, S. Luo, D. Marley, R. Mueller, D. Overton, L. Pernie,D. Rathjens, A. Safonov

Texas Tech University, Lubbock, USAN. Akchurin, J. Damgov, F. De Guio, P.R. Dudero, S. Kunori, K. Lamichhane, S.W. Lee,T. Mengke, S. Muthumuni, T. Peltola, S. Undleeb, I. Volobouev, Z. Wang

Vanderbilt University, Nashville, USAS. Greene, A. Gurrola, R. Janjam, W. Johns, C. Maguire, A. Melo, H. Ni, K. Padeken, F. Romeo,J.D. Ruiz Alvarez, P. Sheldon, S. Tuo, J. Velkovska, M. Verweij, Q. Xu

University of Virginia, Charlottesville, USAM.W. Arenton, P. Barria, B. Cox, R. Hirosky, M. Joyce, A. Ledovskoy, H. Li, C. Neu,T. Sinthuprasith, Y. Wang, E. Wolfe, F. Xia

Wayne State University, Detroit, USAR. Harr, P.E. Karchin, N. Poudyal, J. Sturdy, P. Thapa, S. Zaleski

University of Wisconsin - Madison, Madison, WI, USAJ. Buchanan, C. Caillol, D. Carlsmith, S. Dasu, I. De Bruyn, L. Dodd, B. Gomber, M. Grothe,M. Herndon, A. Herve, U. Hussain, P. Klabbers, A. Lanaro, K. Long, R. Loveless, T. Ruggles,A. Savin, V. Sharma, N. Smith, W.H. Smith, N. Woods

†: Deceased1: Also at Vienna University of Technology, Vienna, Austria2: Also at IRFU, CEA, Universite Paris-Saclay, Gif-sur-Yvette, France3: Also at Universidade Estadual de Campinas, Campinas, Brazil4: Also at Federal University of Rio Grande do Sul, Porto Alegre, Brazil5: Also at Universite Libre de Bruxelles, Bruxelles, Belgium6: Also at University of Chinese Academy of Sciences, Beijing, China7: Also at Institute for Theoretical and Experimental Physics, Moscow, Russia8: Also at Joint Institute for Nuclear Research, Dubna, Russia9: Also at Cairo University, Cairo, Egypt10: Also at Helwan University, Cairo, Egypt11: Now at Zewail City of Science and Technology, Zewail, Egypt12: Also at Fayoum University, El-Fayoum, Egypt13: Now at British University in Egypt, Cairo, Egypt14: Also at Department of Physics, King Abdulaziz University, Jeddah, Saudi Arabia15: Also at Universite de Haute Alsace, Mulhouse, France16: Also at Skobeltsyn Institute of Nuclear Physics, Lomonosov Moscow State University,Moscow, Russia17: Also at CERN, European Organization for Nuclear Research, Geneva, Switzerland18: Also at RWTH Aachen University, III. Physikalisches Institut A, Aachen, Germany19: Also at University of Hamburg, Hamburg, Germany20: Also at Brandenburg University of Technology, Cottbus, Germany21: Also at Institute of Physics, University of Debrecen, Debrecen, Hungary22: Also at Institute of Nuclear Research ATOMKI, Debrecen, Hungary23: Also at MTA-ELTE Lendulet CMS Particle and Nuclear Physics Group, Eotvos Lorand

32

University, Budapest, Hungary24: Also at Indian Institute of Technology Bhubaneswar, Bhubaneswar, India25: Also at Institute of Physics, Bhubaneswar, India26: Also at Shoolini University, Solan, India27: Also at University of Visva-Bharati, Santiniketan, India28: Also at Isfahan University of Technology, Isfahan, Iran29: Also at Plasma Physics Research Center, Science and Research Branch, Islamic AzadUniversity, Tehran, Iran30: Also at ITALIAN NATIONAL AGENCY FOR NEW TECHNOLOGIES, ENERGY ANDSUSTAINABLE ECONOMIC DEVELOPMENT, Bologna, Italy31: Also at Universita degli Studi di Siena, Siena, Italy32: Also at Scuola Normale e Sezione dell’INFN, Pisa, Italy33: Also at Kyunghee University, Seoul, Korea34: Also at International Islamic University of Malaysia, Kuala Lumpur, Malaysia35: Also at Malaysian Nuclear Agency, MOSTI, Kajang, Malaysia36: Also at Consejo Nacional de Ciencia y Tecnologıa, Mexico city, Mexico37: Also at Warsaw University of Technology, Institute of Electronic Systems, Warsaw, Poland38: Also at Institute for Nuclear Research, Moscow, Russia39: Now at National Research Nuclear University ’Moscow Engineering Physics Institute’(MEPhI), Moscow, Russia40: Also at St. Petersburg State Polytechnical University, St. Petersburg, Russia41: Also at University of Florida, Gainesville, USA42: Also at P.N. Lebedev Physical Institute, Moscow, Russia43: Also at California Institute of Technology, Pasadena, USA44: Also at Budker Institute of Nuclear Physics, Novosibirsk, Russia45: Also at Faculty of Physics, University of Belgrade, Belgrade, Serbia46: Also at INFN Sezione di Pavia a, Universita di Pavia b, Pavia, Italy47: Also at University of Belgrade, Faculty of Physics and Vinca Institute of Nuclear Sciences,Belgrade, Serbia48: Also at National and Kapodistrian University of Athens, Athens, Greece49: Also at Riga Technical University, Riga, Latvia50: Also at Universitat Zurich, Zurich, Switzerland51: Also at Stefan Meyer Institute for Subatomic Physics (SMI), Vienna, Austria52: Also at Adiyaman University, Adiyaman, Turkey53: Also at Istanbul Aydin University, Istanbul, Turkey54: Also at Mersin University, Mersin, Turkey55: Also at Piri Reis University, Istanbul, Turkey56: Also at Gaziosmanpasa University, Tokat, Turkey57: Also at Ozyegin University, Istanbul, Turkey58: Also at Izmir Institute of Technology, Izmir, Turkey59: Also at Marmara University, Istanbul, Turkey60: Also at Kafkas University, Kars, Turkey61: Also at Istanbul University, Faculty of Science, Istanbul, Turkey62: Also at Istanbul Bilgi University, Istanbul, Turkey63: Also at Hacettepe University, Ankara, Turkey64: Also at Rutherford Appleton Laboratory, Didcot, United Kingdom65: Also at School of Physics and Astronomy, University of Southampton, Southampton,United Kingdom66: Also at Monash University, Faculty of Science, Clayton, Australia

33

67: Also at Bethel University, St. Paul, USA68: Also at Karamanoglu Mehmetbey University, Karaman, Turkey69: Also at Utah Valley University, Orem, USA70: Also at Purdue University, West Lafayette, USA71: Also at Beykent University, Istanbul, Turkey72: Also at Bingol University, Bingol, Turkey73: Also at Sinop University, Sinop, Turkey74: Also at Mimar Sinan University, Istanbul, Istanbul, Turkey75: Also at Texas A&M University at Qatar, Doha, Qatar76: Also at Kyungpook National University, Daegu, Korea