Physics at Tevatron. Koji Sato KEK Theory Meeting 2005 Particle Physics Phenomenology March 3, Contents
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1 Physics at Tevatron Contents Koji Sato KEK Theory Meeting 5 Particle Physics Phenomenology March 3, 5 mass measurement Top physics cross section Top mass measurement SM Higgs search
2 Tevatron Run II Started Spring 1 proton-antiproton collider with (Run I : antiproton recycler commissioning electron cooling operational by Summer 5 increase in luminosity 36 bunches 36 bunches crossing time Long term luminosity projection : Base goal : Design : by end FY9
3 Tevatron Performance Record : of collisions delivered in Run II Tevatron delivered more than in 4
4 Tevatron Run II Detectors Both general purpose detectors with tracking within magnetic field, precision tracking with silicon, calorimeter, muon chamber D CDF Both detectors have already collected on tape Analyses presented here use
5 Boson Mass Measurement (CDF Important SM parameter setting bound to Higgs mass Fit of transverse mass distribution fit in channel ( : fit in channel ( :
6 Boson Mass Measurement (CDF CDF Run II uncertainties ( : First Run II measurement coming soon! Total uncertainty ( already lower than Run I ( Could approach uncertainty during 5 Already have twice the data on tape Work in progress to minimize systematic uncertainty (lepton energy and recoil scale Run I Results ( CDF D Average LEP :
7 Top Quark Physics - motivation - Most recently discovered quark, and the least well understood Discovered by CDF and D in 1995 Intimate relationship with EWSB Top mass is close to the EWSB scale Strongly coupled to Higgs boson : Top may be sensitive to new physics Studying top tests electroweak theory We can look for non-sm production or decay of top : Background for new particle searches Study on top is only possible at Tevatron until LHC
8 "! ( + Production and Decay of Top Quark at Tevatron Production Predominantly pair production Theoretical total cross section : events in an hour at q q t t + g g t t Decay Decays before it hadronizes #%$ Mode Dilepton ( * Lepton ( + jets All jets + X * Branching Ratio q q t t b W + W - b q q v l
9 Candidate Event with SECVTX Tagged Jets in CDF 8 Jet1 89 GeV CDF II Preliminary Secondary Vertex HT = 9 GeV 6 L xy = 1 mm Y (cm 4 IP L xy = 7 mm Jet 656 GeV MET 4 GeV Electron 57 GeV Jet3 354 GeV X (cm
10 ! " # * $ Top Cross Section Measurement in Lepton+Jets mode at CDF Event Selection : 1 lepton ( jets with SECVTX tagged jet, CDF II preliminary CDF II Preliminary Data Wbb Wcc Wc QCD Mistags Top (67pb Number of tagged events 16 mistags Wbb Wcc non-w Wc WW,WZ,Z ττ Single top Tot bkgd ± 1σ Data (16 pb require H T > for 3 jets Result : %$ %$ # $ ( HT (GeV Number of jets in W+jets
11 Top Cross Section Measurements in CDF - summary 11 Cacciari et al JHEP 44:68 (4 m =175 GeV/c t CDF Run Preliminary Dilepton: Combined 7 ± 1 4 ± 1 17 (L= pb Dilepton: MET, # jets 86 ± 4 5 ± (L= 193pb Lepton+Jets: Kinematic 47 ± ± (L= 193pb Lepton+Jets: Kinematic NN 67 ± ± (L= 193pb Lepton+Jets: Vertex Tag+Kinematic 6 ± ± 1 1 (L= 16pb Lepton+Jets: Vertex Tag 56 ± 11 1 ± 6 9 (L= 16pb σ(pp tt (pb CDF Run 1 Combined m t =17 GeV/c m t =175 GeV/c m t =18 GeV/c CDF Run Preliminary s (GeV Dilepton: Combined Lepton+Jets: Vertex Tag Cacciari et al JHEP 44:68 (4 m t =175 GeV/c Lepton+Jets: Double Vertex Tag 5 ± 19 4 ± 8 11 (L= 16pb Lepton+Jets: Jet Prob Tag 58 ± 1 13 ± (L= 16pb Lepton+Jets: Soft Muon Tag 5 ± 19 9 ± 1 13 (L= 193pb All Hadronic: Vertex Tag 78 ± 5 5 ± 3 47 (L= 165pb σ(pp tt (pb Many different methods have been applied Measurements are consistent with each other Measurements are consistent with SM
12 Top Mass Measurement - Motivation Top mass is a fundamental parameter of SM Top and mass measurements constrain Higgs mass VEV of Higgd field - special role of top quark? Mode Br ( dilepton 5 Clean but few signal Two lepton+jets 3 One in final state all jets 44 Challenging background in final state
13 < $ ## / D $ $ $ - Template Method (CDF 1 Top Mass in jets from, and -jets 1 jet-parton permutations Event Selection : solutions, 1 lepton ( Wrong reconstruction combinatorial background jets : solutions -tagged jets for 3 jets th jet fit! " " $ $ $% # -, ( * -,, *, ( :; % D ACB F E : ACB, E > ACB, =6> / Minimization with as a free parameter Choose solution with minimum reconstructed mass in each event
14 : Top Mass in -taggers : - Template Method (CDF SECVTX - displacement of secondary vertex Jet Probability - impact parameter of tracks Subdivide the sample into, 1, and tag samples Parametrize the reconstructed mass distribution as a function of top mass using Monte Carlo events parametrized distributions for tag sample Template Functions for Tag Channel arbitrary scale 4 CDF Run II Preliminary m = 145 GeV/c top m top = 155 GeV/c m = 165 GeV/c top m top m top = 175 GeV/c = 185 GeV/c m = 195 GeV/c top m = 5 GeV/c top background Reconstructed Top Mass (GeV/c HERWIG signal samples with different inputs Background template is constructed adding different physics processes
15 # # Top Mass in Likelihood fit with tag sample Events/(1 GeV/c Data (11 evts Signal + Bkgd Bkgd only - Template Method (CDF 3 and background frac as free parameter +61 M top = (stat GeV/c sample Reconstructed Top Mass (GeV/c of Candidates tag tag tag Top mass (GeV/c CDF Run II Preliminary Reconstructed Top Mass (GeV/c Results : tag sample combined -ln(l/l max * $? F $ Likelihood vs top mass L = 16 pb, 1 and tag samples combined -ln(l/l max Likelihood vs top mass M top = L = 16 pb L = 193 pb CDF Run II Preliminary GeV/c (1 tag top mass (GeV/c (tag
16 - DLM (CDF 1 Top Mass in Event Selection :, 1 lepton ( Exactly 4 jets with of the 4 jets SECVTX tagged according to Matrix Element for Dynamical Likelihood Method Calculate likelihood as a function of each " $ Observables Partons Parton Distribution Function Probability for of system Matrix element Transfer function
17 ! # Top Mass in - DLM (CDF Candidates with background multiplied likelihood -ln(l/l max events joint likelihood CDF Run II Preliminary (16 pb After Background Consideration(4 events ± 5 (statonly GeV/c (GeV/c M Top 1765 ± GeV/c mapping functions Mass shift ( M top GeV/c all combined NonW mistag Wbb Wcc Wc SingleTop WW CDF Run II Preliminary Signal M top =175 GeV/c Background Fraction(% Result : $ F$ + Events/(1Gev/c Maximum Likelihood Mass 7 CDF Run II Preliminary (16 pb Signal MC : M top = 175GeV/c 6 MC Prediction Signal ttbar(mc Backgroud(MC Data events Maximum Likelihood M Top (GeV/c
18 Top Mass Measurements - Summary CDF Run II results 1 CDF Run Preliminary 166 Dilepton: φ of ν 17 ± ± 74 (L= 193pb Dilepton: P tt 1765 ± ± 69 (L= 193pb 11 Dilepton: ν weighting 1681 ± ± 86 (L= pb 64 Lepton+Jets: Multivariate 1796 ± ± 68 (L= 16pb z D Run II results Lepton+Jets ( : 49 Lepton+Jets: M 177 ± ± 66 (L= 16pb reco 47 Dilepton ( : 45 Lepton+Jets: DLM 1778 ± ± 6 (L= 16pb 51 Run 1 CDF Lepton+Jets 1761 ± ± 53 (Run I only 36 Run 1 D Lepton+Jets 181 ± ± 39 (Run I only 7 Run 1 World Average 178 ± ± 33 (Run I only Top mass (GeV/c
19 Top Mass Measurements (CDF - Prospects We are updating the measurements with of data in CDF double stat Current systematic uncertainty dominated by Jet Energy Scale (JES template DLM CDF Run II Preliminary source combined tag (GeV/ (GeV/ ISR FSR 1 1 PDF b-tagging 7 bkgd shape jet resolution jet energy scale generator 11 3 total Lots of work done to reduce JES in CDF Expect JES to scale down to level this Spring
20 SM Higgs Production and Decay at Tevatron Tevatron has a sensitivity to Higgs with mass Decay branching ratios gg h SM σ(pp _ h SM +X [pb] s = TeV M t = 175 GeV CTEQ4M Decay branching ratios 1 Branching Ratio 1 bb _ ττ WW gg ZZ 1 qq h SM qq qq _ h SM W cc _ 1 - gg,qq _ h SM tt _ bb _ h SM qq _ h SM Z gg,qq _ h SM bb _ γγ Zγ M h [GeV] SM Higgs Mass (GeV/c
21 Event Selection : 1 lepton ( jets with Search (CDF,, of the jets SECVTX tagged q q W * H W b b v l di-jet mass Events / 1 GeV/c ± W bb Search Dijet Mass Distribution (> 1 b-tag CDF Run II Preliminary 16 pb ± W +jets ( Data 1 b-tag ± W +light flavors ± W +heavy flavors Top ± + W Z,W W ± non-w,z Z and Z τ + τ - - ± W H 1 (m H = 115 GeV/c Mean = 141 ± GeV/c Width = 173 ± GeV/c limit on (pb b b X Br (X ± σ (pp W ± $ W bb Search 95% CL Upper Limit CDF Run II Preliminary 16 pb 1 Expected Limit ± 1σ Data LO Technicolor (pp W ± π T ± W bb ± ± NLO Standard Model Higgs (pp W H W bb Mass (GeV/c New Particle Mass (GeV/c
22 Event Selection : leptons ( No jets with Search (CDF, Opposite signed leptons or, g g f f h l + W + ν W - l - ν dn evt /dφ ll CDF Run II Preliminary, L int data 1 H WW WW fakes DY ee DY µ µ DY ττ WZ ZZ tt M H = 184 pb = 18 GeV limit on σ(gg H BR(H WW (pb $ Φ ll Higgs Mass (GeV/c
23 Event Selection : 1 lepton ( nd lepton ( Same signed leptons, background vs observed Search (CDF events limit on WW (pb 1 1 q q W * W H - W + W - sensitive to bosophilic Higgs $ Cross section upper limit of WH signal v l - v l - v l - q q CDF Run II Preliminary pb σ(wh Br(H Observed 95 % CL limit SM higgs Bosophilic higgs Higgs mass (GeV/c
24 Higgs Search - summary
25 # Summary Tevatron, CDF and D are operating well $ F$ + (DLM in Updated results are coming up with double amount of data ( First measurement of methods with by template/dlm Limits on SM Higgs Cross Section Consistent with our expectation Work in progress on new channels ( few dozen in Run II to be combined with other, SM prediction
26 backup
27 Single Top Search (CDF 1 s-channel t-channel Direct measurement of Sensitive to new physics -, anomalous coupling, FCNC Challenging : small cross section signature similar large additional backgrounds Event Selection : 1 lepton ( jets with, of the jets SECVTX tagged
28 Single Top Search (CDF separate search Data Distribution vs Expectation Events per 4 units CDF Run II Preliminary Data versus SM expectation L dt = 16 pb Entries 33 Data t-channel s-channel ttbar non-top combined search Data Distribution vs Expectation Events / 15 GeV pb CDF Run II Preliminary Entries 4 Data single top tt non-top Q η [GeV] H T Results : $ $ ( ( CL CL Results : $ $ ( CL
29 Web Pages CDF public resuls web page : D public resuls web page :
30
CDF top quark " $ )(! # % & '
$% CDF quark 7 3 5 ( "#! Tevatron Run II Started Spring 1. proton-antiproton collider with (Run I :. antiproton recycler commissioning electron cooling operational by Summer 5. increase in luminosity.
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