Review of Tevatron Results Ivan K. FuriUniversity of Chicago Enrico Fermi Institute

OverviewQuantum Chromodynamicsjet cross section measurementsSearches for New Phenomenachargino neutralino searchesSearch for di-electron / di-photon resonancesB PhysicsObservation of Bs OscillationsTop, Higgs and EWK a little later this afternoon

Tevatron ColliderCDFTevatronMain InjectorD01 kms = 1.96 TeV

Tevatron luminosityPeak luminosity of~2.31032 cm-2s-1 so farDelivered integrated luminosity ~2 fb-1

Data set has doubled every year

Expect 4 8 fb-1 by the end of 2009CDF/D operate at ~85% efficiency

Results in the following are based on 0.3 1 fb-1 of data

New (tracking in B-field)Silicon detectorFiber trackerUpgradedMuon system, cal. electronicsDAQ, (track) trigger systemDisplaced-vtx triggerThe upgraded D detector Have layer 0 at r ~ 1.7 cm installed since summer 06 !

The upgraded CDF II DetectorMajor upgrades for Run II:Drift chamber: COTSilicon: SVX, ISL, L00 at r ~ 1.5 cm8 layers700 k readout channels6 m2material:15% X0Forward calorimetersForward muon systemImproved central muon systemTime-of-flightPreshower detectorTiming in EM calorimeterTrigger and DAQ

Quantum Chromodynamics

Jet Cross Sections from D0Cone clustering aglorithm, Rcone = 0.7

Jet Cross Sections from CDFKT clustering algorithmMidpoint clustering algorithm

New Phenomena

Chargino-Neutralino Searches

3 leptons + ET (from and neutralino)Very small SM backgroundSame sign dilepton channel adds acceptance at the expense of background

Decays to leptons: depends on slepton masses lepton flavor depends on tanbeta Poisson uncertainty on the predicted number of events not shown Golden mode for SUSY discovery at the Tevatron2 more D0 analyses involving taus

Chargino-Neutralino limitsChoose an mSUGRA-inspired low tan beta scenarioslepton mass degenerateno slepton mixingResults are model dependentBeyond LEP in these scenariosM > 127GeV (CDF)M > 140GeV(D0)

Di-lepton / di-photon resonances

Backgrounds:Mainly Drell-YanWW, diphoton, jets faking leptonsCalculate probability of data vs SM prediction at each massMass window size adapted to mass resolution (~3%)

Model independent measurement

Interpretation: RS Graviton

B Physics

Unitarity TriangleCKM Matrix (Wolfenstein parameterization)

Unitarity of CKM Matrix

|Vcb|=|Vts|

|Vcd| is known to ~5% precision 0.2240.012

B Mixing in the Standard ModelBs mixing: box diagram

md = 0.510+0.005 ps-1 (HFAG 2005) lattice QCD calculation: f2BdBBd = (246+25+11 MeV)2 |Vtd| determination limited at ~13%Ratio between Dms and Dmdtheoretical uncertainties cancel in the ratio: x = 1.21+0.047 determine |Vts|/|Vtd| ~3.4% precision-0.035

Bs Mixing Measurement Techniqueopposite side : look for other B meson in event, if it was matter, the Bs was antimatter!same side: fragmentation remnants vertexing (same) sideopposite sidee,

Asymmetry a useful quantitywhat about detector effects?Right SignWrong Sign

Realistic Detector Effectsflavor tagging power,backgrounddisplacementresolutionmomentumresolutionmis-tag rate 40%(L) ~ 50 m(p)/p = 5%

All Effects TogetherThis is why previous measurements have notbeen able to observe Bs mixing!

Previous ResultsCKM fit, EPS 2005: ms = 18.3 +6.5 ps-1 D0, March 2006: p = 5%17 ps-1 < ms < 21 ps-1 CDF, April 2006: p = 0.2%ms=17.31+0.33(stat) 0.07(syst) ps-1-0.18-1.5PRL 97, 021802 (2006) PRL 97, 062003 (2006)

D0 Yield Upgradesprevious analysis used +Ds() (5600 events)new: e+Ds() (+ 1000 events)new: +Ds(K*K) (+13 000 events)opposite side tagging unchanged

Combined D0 Amplitude Scanprob of stat. fluctuation 8%; 17 ps-1 < ms < 21 ps-1

CDF Yield Upgrades: Semileptonicuse of particle identificationcombined TOF and energy loss in trackermost improvement in DsK*K (+35%)rejects D- K* in comb. backgroundyield: 62k (was 37k)S/Bx2 for DsK*K, added new trigger paths

CDF Yield Upgrades: Hadronicpartial reconstruction, particle ID, NN selection

B ModeSignal S/B()2000 (1600)+13%partial3100 (-)-(K*K)1400 (800)+35%(3)700 (600)+22%()3700 (500)+92%(K*K)3600 (200)+110%(3)3200 (-)-Total8700 (3700)-

CDF Tagging Upgrades: Opposite Side Tagger new opposite side kaon taggercombination of opposite side tags: NN vs hierarchy

taggerefficiencydilutionD2Muon4.60.034.70.50.580.02Electron3.20.030.30.70.290.01JQT95.50.19.70.20.900.03Kaon18.10.111.10.90.230.02OST Old95.60.111.90.11.340.03OST NN95.80.112.70.21.540.04

CDF Tagging Upgrades: Same Side Taggerold SSKT used only particle id information dilution is found to depend on several kinematic variablesNN with PID, kinematic inputhadronic: D2=3.5% (+0% relative improvement)semilept: D2=4.8% (+8% relative improvement)

CDF Combined Amplitude Scan

CDF Likelihood Shape log [ L(A=0) / L(A=1) ]

min log(L) = -17.26

probability of random tags conspiring to produce a likelihood this deep?

Probability of a Statistical Fluctuation28 trials out of 350 million p = 8x10-85 std. deviations = 5.7 x 10-7 OBSERVATION

Frequency Measurementsubmitted to PRL last MondayArXiv: hep/ex 0609040systematic:Decay time scaleOther effects are small

agrees with SM: 18.3+6.5 ps-1agrees with previous measurement:17.31+0.33 (stat) 0.07 (syst) ps-1ms = 17.770.10(stat)0.07(syst) ps-1-1.5-0.18

Measurement of Vtd/Vtsrelation between mq and Vtq:

inputs:m(Bd)/m(Bs) = 0.98390 = 1.21 +0.047 mD = 0.507 0.005 ps-1|Vtd/Vts| = 0.2060 0.0007(exp) +0.0081 (theo)Belle PRL 96 221601 (2006):|Vtd/Vts| = 0.199 +0.026(exp) +0.018 (theo)-0.035-0.0060-0.025-0.016

Conclusionsmany results from both detectors with 1 fb-1updated jet cross sections searches for chargino-neutralino and RS graviton/Zafter 20 years of searching, Bs oscillations finally observed at the Tevatron!frequency consistent with Standard Model predictionextraction of Vtd/Vts now theory limited (x10)

Time Domain Plottime folded modulo oscillation period

only hadronic decays participate

A=1.28 from hadronic-only scan

Uncertainty on ms

Bs Meson DecaysHadronic Decays

Bs!Ds, Ds3Ds!, K*K, small branching fractionexcellent momentum resolution excellent decay time resolutionSemileptonic Decays

Bs ! Ds l Ds ! , K*K, large branching fractionmissing momentum corrected on average (K factor)inferior decay time resolution

Decay Time ResolutionAvg resolution ~ period at ms = 18 ps-1superior decay time resolutiongives CDF sensitivity at larger values of msthan previous experiments

Semileptonic vs Hadronic vs Partial

Fourier Transform of AsymmetryUseful properties:A(m) 0 if no mixing at mA(m) 1 if mixing at m calibrated for detector effects

Neural Network Selection

Amplitude ScanningFrequency (arb. units)

Amplitude Scan: Semileptonic Modes

Amplitude Scan: Partially Reconstructed Decays

Amplitude Scan:Golden Mode

Amplitude Scan: Hadronic Modes

Amplitude Scan: Opposite Side Tags

Amplitude Scan: Same Side Tags

Amplitude Scan in Sidebands

Bs Meson Decay Time

Reconstructing Bs Decay SignalsBs signalrandomtrackcombinationsmissingdecayfragments

Jet Cross Sections, Continued

Spend more time hereWords about different channelsWhat are all those D0 things on the plot?Mention the plotWhy spin 1 in this limit?Plot with 10-2Replace the plot with the theoretical cross section