CMS Results: Higgs and SUSY - …people.physics.tamu.edu/.../121205_Tsukuba_Higgs+SUSY_v2b.pdfa Higgs boson mass hypothesis with a local significance of 4.1 sigma. The global significance

Teruki Kamon

CMS Results:

Higgs and SUSY

December 2012 1 CMS: Higgs and SUSY

Mitchell Institute for Fundamental Physics and Astronomy

Texas A&M University

&

Department of Physics

Kyungpook National University

HEP Seminar, University of Tukuba

December 5, 2012

Higgs and SUSY

CMS & PFlow Algorithm

Higgs Analyses

– ZZ

– WW

– gg

– tt

– bb

– Combo

SUSY?

Summary

OUTLINE


https://twiki.cern.ch/twiki/bin/view/CMSPublic/PhysicsResultsHIG


H

Who Wanted “Higgs Boson”?


Authors Article F. Englert and R. Brout Phys. Rev. Lett. 13 (1964) 321

P. W. Higgs Phys. Lett. 12 (1964) 132

P. W. Higgs Phys. Rev. Lett. 13 (1964) 508

G. S. Guralnik, C. R. Hagen, and T. W. B. Kibble Phys. Rev. Lett. 13 (1964) 585

We Did …

The six authors of the 1964 PRL papers, who received the 2010 J. J. Sakurai Prize for

their work. From left to right: Kibble, Guralnik, Hagen, Englert, Brout. Right: Higgs.


Production & Decays SM & MSSM


URL: https://twiki.cern.ch/twiki/bin/view/CMSPublic/PhysicsResultsHIG

Search Strategy

All the mass

range is

reachable

(actually large

part of it has

already been

excluded).

All channels

being

investigated.


126 GeV

October 2010


SUSY

December 13, 2011 Delivered by LHC : 5.72 fb-1

Recorded by CMS : 5.20 fb-1

(about 92%)

High quality data : 4.7 fb-1


Keep in mind they are preliminary results; Keep in mind they are small numbers; Keep in mind we will run in the next year.

Newly approved

analysis including

VBF Hgg (was not

in the CERN

seminar)

Enhanced sensitivity

in the low mass

region

Global p-value (with

LEE) is 2.1 sigma

January 2012


We have observed a new boson

with a mass of

125.3 ± 0.6 GeV at 4.9 s !

[GeV]4lm

Eve

nts

/ 3

GeV

0

2

4

6

8

10

12

[GeV]4lm

Eve

nts

/ 3

GeV

0

2

4

6

8

10

12 Data

Z+X

*,ZZgZ

=126 GeVHm

m, 2e2m7 TeV 4e, 4

m, 2e2m8 TeV 4e, 4

CMS Preliminary -1 = 8 TeV, L = 5.26 fbs ; -1 = 7 TeV, L = 5.05 fbs

[GeV]4l

m80 100 120 140 160 180

July 4, 2012


Higgs Signal Strengths

Production and decay rates could be

deviated from the SM expectation

through SUSY particles in loop-

induced processes

Could be …


SUSY

SUSY is : a) Supersymmetrized Standard Model

(“Democratic” solution between Fermions and Bosons);

b) An elegant solution to solve the problem associated with the Higgs mass around 1 TeV;

+

Unification!

c) Beautifully connecting the Standard Model with an ultimate unification of the fundamental interactions around 1 TeV;

d) Cosmologically consistent with a Dark Matter candidate around 1 TeV.

e) There must be a light Higgs boson:

below ~150 GeV.

13

Supersymmetry (SUSY)

CMS 2011 Physics

Very rare decays Searches for new physics with MET

Precision measurements

No signs of new physics (yet)

even in 2012

14 December 2012 14 CMS: Higgs and SUSY

FCNC in Bsmm

Br(Bsmm)

2

+

15

This is one of interesting rare decays to test new physics such as SUSY:

Br(Bsmm)SM ~ 3 x 10-9

Br(Bsmm)SUSY ~ Br(Bsmm)SM x (10 ~ 1000)


LHCb at HCP2012

New


Implications

[Light 3rd Generation SUSY Particles] Light stop direct stop production

Light stau direct EWKino production

[Lightest SUSY Particles] Higgsino LSP chargino and neutralinos below 200 GeV, with mass

splittings of order 10 GeV. It is very difficult for LHC to observe these

particles. See, for example, Papucci, Ruderman, Weiler, arXiv:1110.6926; Baer, Barger, Huang, Tata, arXiv:1203.553

[Ruling out Minimal Models] mGMSB and mAMSB are ruled out;

mSUGRA : A0 = 0 is ruled out; stau-neutralino is mostly ruled out. See, for example, Howard Baer, Vernon Barger, Azar Mustafayev, “Neutralino dark matter in mSUGRA/CMSSM with a 125 GeV light Higgs scalar”, JHEP 1205 (2012) 091, DOI: 10.1007/JHEP05(2012)091, e-Print: arXiv:1202.4038 [hep-ph]

[Moving to Non-minimal Models]

Where We Stand …

17 December 2012 CMS: Higgs and SUSY

SUSY Probe Metric at LHC

Minimal SUGRA

Non-Universal

SUGRA

),tan,,( 01/20

2~0

1

Ammh

D

),,tan,,( 01/20

2~0

1

m

Ammh D

July 4, 2012

E

Dec 13, 2011

Tevatron

Precision

We test a minimal case first, followed by “non-minimal” cases.



CMS Detector

g

m

g

m m

m


CMS Detector


Excellent tracker, High resolution EM calorimeter,

Redundant muon detector, Good hadron calorimeter

Particle ID


Collider Detectors

ATLAS CMS CDF II D0 II

Magnetic

field

2 T solenoid +

toroid (0.5 T barrel

1 T endcap)

4 T solenoid +

return yoke

1.4T solenoid 2T solenoid

+ toroid (1.8T)

Tracker Si pixels, strips +

TRT

σ/pT ≈ 5x10-4 pT +

0.01

Si pixels, strips

σ/pT ≈ 1.5x10-4 pT +

0.005

Si strips + drift

chamber

Si strips +

scintillating fiber

EM

calorimeter

Pb+LAr

σ/E ≈ 10%/√E +

0.007

PbWO4 crystals

σ/E ≈ 3%/√E 0.003

Pb+scintillator

σ/E ≈ 13.5%/√E

0.015 in barrel

U+LAr

Hadronic

calorimeter

Fe+scint. / Cu+LAr

(10λ)

σ/E ≈ 50%/√E

0.03

Brass+scintillator (7

λ + catcher)

σ/E ≈ 100%/√E

0.05

Iron+scintillator

σ/E ≈ 50%/√E 0.03

in barrel

U+LAr (Cu or

stainless in outer

hadronic)

Muon σ/pT ≈ 2% @ 50GeV

to 10% @ 1TeV

(ID+MS)

σ/pT ≈ 1% @ 50GeV

to 10% @ 1TeV

(DT/CSC+Tracker)

Rapidities to 1.4 Rapidities to 2.0


All physics objects (charged hadrons, neutral hadrons, g, e, m, t jets, MET) are reconstructed with the PF algorithm.

Basic idea:

– Reconstruct and identify all different types of particles

– Apply corresponding calibrations

– The list of “particles” is given to the jet clustering and missing ET

(MET) reconstruction algorithm

Particle Flow (PF) Algorithm


Particle Flow (PF) Algorithm

Improvements in all the reconstructed objects

Jets and MET : resolution and energy scale improved by 2-5

times w.r.t. calorimeter based reconstruction

Lepton isolation : background rejection improved by a factor 2 at

same efficiency

Exellent reconstruction and identification for th

See the following pages for basic concept December 2012 25 CMS: Higgs and SUSY

All physics objects (charged hadrons, neutral hadrons, g, e, m, t jets, MET) are reconstructed with the PF algorithm.

Basic idea:

– Reconstruct and identify all different types of particles

– Apply corresponding calibrations

– The list of “particles” is given to the jet clustering and missing ET

(MET) reconstruction algorithm

Charged hadrons

~65% of jet energy

Use the high resolution tracker

~1% at 100 GeV


Photons

~25% of jet energy

Use high resolution / good

granularity ECAL

Granularity: 0.02 ()

Energy resolution: ~2%/E

December 2012 CMS: Higgs and SUSY

Neutral hadrons

~10% of jet energy

Use HCAL

Granularity: 0.1 ()

Energy resolution: ~100%/E


Jet:

Charged hadron (solid)

Photon (dashed line)

Neutral hadron (dotted line)

Particles clustered in jets



7 TeV: Phys. Lett. B 710 (2012) 403

7+8 TeV: Phys. Lett. B 716 (2012) 30

and CMS-HIG-12-015

and https://twiki.cern.ch/twiki/bin/view/CMSPublic/Hig12015TWiki


L = 5.1 fb-1 (7 TeV) + 5.3 fb-1 (8 TeV)

pT1 > m(gg)/3 & pT2 > m(gg) /4 ; M = 2Eg1 Eg2 (1 – cosq) Photon ID MVA based on shower topology and isolation;

Di-photon MVA classifications with signal-like

kinematics, good mass resolution, per-event vertex

probability, photon-likelihood.

6 categories optimized for the best expected limits (4 di-

photon MVA categories; 2 di-jet tagged categories).

Backgrounds are fit to data Irreducible BG: pp gg

Photon + jet: pp gj g “g”

Dijet : pp jj “g” “g”

Z ee “g” “g”

Fakes – largely controlled by isolation, lateral shower shapes,

electron track veto, Ehad/Eg

BDT trained on simulated Higgs and g+jet events

Highlights of Di-photon Analysis


PbWO4 Crystals in CMS


M(gg) Resolution : dE/E


5x5 crystals

3x3 crystals

(uncorrected) 3x3 crystals

(corrected)

Simulation

Calibration


Calibration


M(gg) Resolution : Vertexing


pT1 > m(gg)/3 & pT2 > m(gg) /4

Photon ID using MVA based on

shower topology and isolation;

Di-photon MVA classifications

with signal-like kinematics, good

mass resolution, per-event

vertex probability, photon-

likelihood.

6 categories optimized for the

best expected limits (4 di-photon

MVA categories; 2 di-jet tagged

categories).

BDT trained on simulated Higgs

and g+jet events

Di-photon Categories


Di-jet tagged Di-Photon

Two (one in 2011) classes of events (according to mjj) with S/B an order

of magnitude larger than inclusive classes Sensitivity increases by

10% December 2012 39 CMS: Higgs and SUSY

Decay products

Highest energy jets in the event selected with large pseudo-rapidity

gap Enriches in VBF content and rejects background

Di-photon BG Modeling Background model fit to the m(gg) distribution for the 6 categories,

together with a simulated signal (mH = 125 GeV). The sum of the event

classes together with the sum of the five fits is also shown.

Background modeling: polynomial shape with order from 3 to 5.

Potential bias from background model is less than 20% of statistical

uncertainty.


[First 4 classes] A 5th order polynomial function in 100-180 GeV is found to be unbiased in either excluding or finding the Higgs boson signal, compared to the statistical uncertainties of the fit. [VBF] A 2nd (3rd) order polynomial function

[Consistency check] The di-photon mass spectrum that is observed after the full event selection is found to agree with the distribution predicted by MC simulation, within the uncertainties on the cross sections of the contributing processes which is estimated to be about 15%.

Di-photon BG Modeling

Cat 0 Cat 1 Cat 2

Cat 3


VBF tight VBF loose

Di-photon S/B-weighted Mass

Each event class is weighted by its S/(S+B) only for

visualization purpose


Mgg= 125.1 GeV 0.4 (stat) 0.6 (syst)

July 4: 125.3 ± 0.6 GeV (stat+syst)

Di-photon : P-Value

125 GeV … The largest excess (above the expected SM background) for

a Higgs boson mass hypothesis with a local significance of 4.1 sigma.

The global significance of observing an excess with a local significance

greater than 4.1 sigma anywhere in the search range 110-150 GeV is

estimated to be 3.2 sigma.


Di-photon Signal Strength

Combined best-fit signal strength for

a SM Higgs boson mass hypothesis of

125 GeV:

s/sSM = 1.56 + 0.43

Signal strength is compatible across

signal categories.


1

Di-photon Summary Expected exclusion limits on s x Br(HSMgg) at 95% CL are

0.76 times the SM cross section at ~125 GeV.

The SM Higgs boson (HSMgg) in the mass ranges [114-

211], [129-132], [138-149] are excluded at 95% CL.

The largest excess above the expected SM background is

observed for a Higgs boson mass hypothesis of 125.1

0.4 (stat)0.6 (syst) GeV with a local (global) significance

of 4.1 (3.2) sigma.

More data are required to ascertain the nature of this

excess.



H ZZ

HZZ4l / 2l2tau (l = e, mu) 5.1 fb-1 (7 TeV, 2011) + 12.2 fb-1 (8 TeV, 2012)

CMS Public Analysis Summary HIG-12-041

HZZ2l2nu 5 fb-1 (7 TeV, 2011) + 5 fb-1 (8 TeV, 2012)

CMS Public Analysis Summary HIG-12-023

HZZ2l2q 5 fb-1 (7 TeV, 2011)

CMS Public Analysis Summary HIG-11-027,

http://arxiv.org/abs/1202.1416, JHEP 04 (2012) 036


http://arxiv.org/abs/1202.1416








H ZZ 4l : Selection


H ZZ 4l : Candidates


H ZZ 4l : m4l

Good agreement between predicted

and observed ZZ continuum.

Z 4l peak is in place and in

agreement with prediction.

Fit of the Z 4l peak shows

δm ~ 0.4 ± 0.28 GeV

and expected resolution.

X ZZ 4l peak is

there and increasing

in statistics

corresponding to

luminosity and

expectation of H ZZ

4l

For m4l = 121.5 ... 130.5 GeV:

o Expected background: 6.5

events

o Expected signal (mH = 126 GeV):

12.5 events

o Signal:Background ~ 2:1

o Observed: 17 events


A A B

17 events

Kinematic Discriminants (KD) To enhance signal vs. background discrimination

Validated with independent implementations of the kinematic discriminants

either using directly the matrix element from JHUGen, MCFM, MADGRAPH,

or CalcHEP, standalone or within the generalized MEKD framework, or using

the Boosted Decision Trees (BDT) multivariate classification technique

trained with the MC samples, and similar performance was observed.


A

B

H ZZ 4l : KD Observed data points (with event-by-event calculated m(4l)-errors) in

black on top of background (left) and the SM Higgs signal at 126 GeV

expectations.

Two approaches checked: simple 1D (mass) fit to discriminate between

signal and background and 2D using: )m|K(P)m(P)K,m(P l4Dl4Dl4


A

B

H ZZ 4l : p-value

7 TeV and 8 TeV: consistent growth of

the peak around 125 GeV.

P-value corresponds to 4.5s.

(ICHEP was: 3.2s)

Other peaks: random fluctuations

(look-elsewhere effect).


1D (m4l) results vs. 2D (KD+m4l).

H ZZ 4l : JP


0+

0-

17 events

H ZZ 4l : JP

0+ vs. 0-:

Expected separation: 1.93 σ

Observed:

0- : is consistent with

observation within 2.45 σ

(2.4% using CLs)

0+ : is within 0.53 σ


H ZZ 4 leptons: Mass

Measured mass:

126.20.6(stat.) 0.2(syst.)

GeV

Uncertainty dominated by

statistical component e

“free” improvement next time

we update results.

Systematics: dominated by

resolution uncertainty.

-‐--‐--‐--‐--‐--‐--‐--‐--‐--‐--‐--‐--‐--‐--Note: Same mass with worse

precision obtained w/o KD or

event-by-event errors as

extra dimensions.

3D Fit (m4l, KD, dm4l)


H ZZ 4l+2l2tau

Even if we already likely

found the SM Higgs boson...

Limit results for the whole

mass interval are:

Check for consistency (vs.

SM prediction)

One could also re-use

limits by re-scaling to s*BR

of a preferred model.


H ZZ 2l2nu

Best “exclusion channel”:

back in 2011 excluded widest

interval of possible masses

with a handful of data.

ICHEP 2012 results: 273-600

GeV excluded.


H ZZ Summary 4.5 sigma of local significance for m(X) ~ 126 GeV

Signal strength: 0.8 +0.35 -0.28 at 126 GeV

0- is consistent with observation within 2.45 sigma (2.4%

using CLs)

0+ is consistent within 0.5 sigma

Upper limits at 95% confidence level exclude the SM

Higgs boson in the ranges 113–116 GeV, 129–720 GeV

(together with 2l2tau).

Agreement with the SM prediction in the whole mass

range.

Results are consistent with previous publications and

with expectations.



Observed Upper Limits HIG-12-045


125

P-Values HIG-12-045


125

Signal Strengths HIG-12-045


Signal Strength



--

--

-

-

0

0

0

0

2

1

0

m

m

scMssM

ccMcsM

scMccMM

ssMcsMM

WZWZ

WZWZ

WZWZ

WZWZ

~Μ

New to Probe h2

Light stop + Higgsino LSP


SUSY World with Lighter 3rd Generation SUSY Particles? Light stop direct stop production


How to Probe Colorless SUSY Sector? 1) Tagging energetic jets (+ MET) from cascade decays

2) Tagging leptons

VBF as a SUSY Probe

What to do with (i) heavy

1st/2nd generation squarks

and gluino, and (ii) small

M?


What to do with (i) heavy

1st/2nd generation squarks

and gluino, and (ii) small

M? 3) VBF (arXiv:1210.0964)

Bhaskar Dutta, Alfredo Gurrola,

Will Johns, Teruki Kamon,

Paul Sheldon, Kuver Sinha

SUSY World with Lighter 3rd Generation SUSY Particles? Light stop direct stop production


How to Probe Colorless SUSY Sector? 1) Tagging energetic jets (+ MET) from cascade decays

2) Tagging leptons


VBF as a SUSY Probe

Higgs Signal Strengths

Production and decay rates could be

deviated from the SM expectation

through SUSY particles in loop-

induced processes

Could be …

SUSY


SUSY VBF at the LHC

))((pp01

0111 tt ++++ ~~jj~~jj

t decay products

arXiv:1210.0964

2 fb


VBF Diagrams ++ WjjWpp

++ 11pp ~~jj


VBF Kinematics

Large MET, large M(jj), large pT jets

arXiv:1210.0964

)( 21 j,jM TE

)( 1jpT

GeV 30)()(

GeV 90)(

GeV 180)()(

011

01

021

-t

+

+

~M~M

~M

~M~~M

Benchmark Point:

Baseline “VBF + MET” Selection:

See the next page …


Baseline VBF+MET Selection

GeV 75 MET GeV; 650)(

0 ;24

GeV 75 )(jp GeV; 50(j)p with jets 2

21

21

1TT

j,jM

.

2 Scenarios

30 GeV 30 GeV


Case 1: Taus via VBF

))((pp01

0111 tt ++++ ~~jj~~jj ))((pp

01

01

021

-+++ ttt ~~jj~~jj


Tau Selection

-1fb 25

20 GeV

Benchmark Point

1% f 55%;

)12( 20/20p with taus 2 T

t

.


Tau Trigger 20 GeV

30 GeV

25 GeV


2Taus+2Jets+MET

2.41

1.77

1.66

BS/S +

BS/S +

BS/S +


Case 2: Muons in VBF

))((pp01

0111 mm ++++ ~~jj~~jj

)12( 20/15p with muons isolated 2 T .


2Muons+2Jets+MET

BS/S +

BS/S +

BS/S +

6.05

4.46

4.15


Case 1 vs. Case 2 )12( 20/15)(pT .m

1% f 55%;

)12( 20/20)(pT

t

t

.

Lower pT cuts help..


Sleptons via VBF (at 14 TeV)

Z/g

~

~

t~

[Taken from Fig. 2 of arXiv:9912232]

slepton production cross sections at 14

TeV. They are pointing out that slepton

pairs produced via VBF in anomaly

mediated supersymmetry breaking (AMSB)

model have very characteristic and almost

clean signal at the LHC.

2 fb

~

t~

Z/g


(e.g.) Light Stau Phenomenology arXiv:1205.5842

Marcela Carena, Stefania Gori, Nausheen R. Shah,

Carlos E. M. Wagner, Lian-Tao Wang

Complementary Slepton Searches via VBF

~10 fb (VBF)

14 TeV LHC


(e.g.) Higgs in pMSSM arXiv:1206.5800

Matthew W. Cahill-Rowley, JoAnne L. Hewett, Ahmed Ismail, Thomas G. Rizzo

400

Complementary Charginos/Neutralinos Searches via VBF December 2012 83 CMS: Higgs and SUSY

Summary Difficult to detect charginos, neutralinos, sleptons with

mass splitting of order 10-20 GeV at the LHC.

VBF trigger: two forward jets

with pT >~50 GeV, || >~4 and

M(jj) >~700 GeV.

VBF processes: a complementary way to probe low mass

colorless SUSY states at the LHC even at 8 TeV (14 TeV).

We could probe charginos (sleptons) directly up to 200

GeV (~500 GeV) with 20-25 fb-1 (100 fb-1).

t decay products



PPC Cube

Indirect DM

Search

Dark Matter

DM Search at

Collider

Direct DM

Search

• What are we made of?

• Is the dark matter a new particle?

• How to detect the dark matter?

• Interconnection between particle physics and cosmology

US Department of Energy (DOE); Korea National Research Foundation (NRF); SFB Fellowship (Hamburg University/DESY)


Interconnection between Particle Physics and Cosmology


PPC 2011 at CERN, June 14-18

PPC 2012 at KIAS, Korea, Nov. 5-9

PPC 2013 in ???

“PPC”

PPC Cube


CBS comedy “Big Bang Theory”

(Season 1 Episode 15)



© Premiere Props

2007

2012

2008

2009

2010

2011


PPC Cube Evolution

My Life Style

1

2

3

0 Mitchell Institute for Fundamental Physics and Astronomy

4

SFB Program WCU Program

Teruki Kamon 90 PPC

1

2

3

0 Mitchell Institute for Fundamental Physics and Astronomy

4

SFB Program WCU Program

Teruki Kamon 91 PPC

De-evolution

I feel like a Backpacker …

Backup



H WW l l 12 fb-1 (8 TeV)

No signal mass peak counting experiment

Challenge = remove & control large backgrounds

Signal characteristics:

Only 2 opposite sign, isolated leptons

Significant MET No mass peak

No b-jets, no additional low PT μ

With additional 0, 1 or 2 jets (VBF)

Small ΔΦ(l+l-) due to Higgs scalarity

Selection cuts

Tight lepton ID

Large MET & Z veto

Classification by # of jets (PT > 30 GeV)

& b-jet veto

Kinematic discriminants: M(ll) & ΔΦ(l+l-)

m(H)-dependent cut optimization


0-jet

1-jet

8 TeV

7+8 TeV


H WW l l

Sizable Excess !!

Expected (Observed) Significance

of 4.3 (3.1) sigma! Best fit value for signal strength :

0.74 + 0.25

H WW l l


H WW l qq

8 TeV

Exclusion range: 215--‐490 and 525--‐600 GeV at 95% CL

7+8 TeV


HWW Summary Both single-lepton and di-lepton channels with 12 fb-1 of 8

TeV luminosity

Heavier masses are excluded at 95% CL

3.1 sigma excess at light masses (with 4.1 sigma expected)

First observation of Higgs-like boson in WW mode


CMS PAS HIG-12-043, CMS PAS HIG-12-051


L = 17 fb-1 (7+8 TeV)

5 Inclusive Di-Tau Analyses : eth, mth, em, mm, thth

2 Explicit Analyses of the production: WH ad ZH

5 “event topology” categories to have enriched signal-to-

background ratio and maximize the sensitivity

Limit based on the fit of the full mass distribution

Highlights of Di-Tau Analysis


Tau Reconstruction / ID


MET


Di-Tau System


Dominant Backgrounds


Tau pT = 69 GeV

MET = 97 GeV

Muon pT = 20 GeV

Jet2 pT = 46 GeV

Jet1 pT = 177 GeV

VBF Candidate


VBF Category


Sensitivity


Observed Limit (incl. Htt)


WH and ZH


Observed Limits (Combined)


Signal Strength


Di-Tau Summary Sensitive to both the SM Higgs boson and to the neutral

Higgs bosons predicted by the MSSM.

Compatible with the SM Higgs boson signal at 125 GeV

with background only hypothesis.

Signal strength : 0.72 + 0.52


http://cdsweb.cern.ch/record/1421611?ln=en


L = 4.7 fb-1

5 channels: W(m)H, W(e)H, Z(mm)H, Z(ee)H, Z()H,

along with 2 b-tagged jets

Combined Secondary Vertex (CSV) b-tagging algorithm

(CMS-BTV-09-001) CSV > 0.90 (b) = 50%, (c) = 6%, (f) = 0.15%

CSV > 0.50 (b) = 72%, (c) = 23%, (f) = 3%

Impressive result where SF are validated up to pT ~ 600 GeV

Event selection,

optimized by BDT

Highlights of VH(bb) Analysis


VH(bb) Event Selection BDT and m(jj) Analysis Cuts


H(bb) Mass and Summary

No significant excess of events above the expectation from

background. Upper limits on the s(VH)*Br(Hbb), with respect to the

expectations for a SM Higgs boson, are derived for a Higgs boson in the

mass range 110–135 GeV. In this range, the observed 95% CL upper

limits vary from 3.4 to 7.5 times the SM prediction; the corresponding

expected limits vary from 2.7 to 6.7.

BDT Analysis m(jj) Analysis


Documents

CMS Results: Higgs and SUSY - …people.physics.tamu.edu/.../121205_Tsukuba_Higgs+SUSY_v2b.pdfa Higgs boson mass hypothesis with a local significance of 4.1 sigma. The global significance