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CDF Experiment in JFY2002

CDF Experiment in JFY2002. Shin-Hong Kim (University of Tsukuba) May 30, 2003 at KEK. Tevatron status. 2002. 2001. Initial Luminosity. July 01. Luminosity goals for RunⅡa : 5-8x10 31 cm -2 sec -1 w/o Recycler 2x10 32 cm -2 sec -1 with Recycler 2 fb -1 in 2005 → RunⅡb Achieved:

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CDF Experiment in JFY2002

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  1. CDF Experiment in JFY2002 Shin-Hong Kim (University of Tsukuba) May 30, 2003 at KEK

  2. Tevatron status 2002 2001 Initial Luminosity July 01 Luminosity goals for RunⅡa: • 5-8x1031 cm-2sec-1 w/o Recycler • 2x1032 cm-2sec-1 with Recycler • 2 fb-1 in 2005 →RunⅡb Achieved: • 4.6 x1031 cm-2sec-1 in May ’03 • 220 pb-1 delivered until April ’03 • 170 pb-1 are on tape • 70 pb-1analysed for 2003 winter conference Schedule: • 0.3-0.4 fb-1 in total by October 2003 • 2 fb-1 in RunⅡa by the end of 2005 • 11-15 fb-1 in RunⅡa + RunⅡb Now 2001 2002 220 pb-1 Integrated Luminosity Delivered 170 pb-1 On tape

  3. Drift Chamber Muon System Central Calor. New Solenoid Old Partially New Time-of-Flight Plug Calor. Japan Group Contribution ○ Plug Calorimeter Scintillating tile/fiber unit ○ Silicon Microstrip detector SVXⅡ Silicon sensor ○ Inetrmediate Silicon Layer ISL Silicon sensor○ DAQData logger, Monitor ○ TOF Counter Fine-mesh photomultiplier ○ RunⅡb Silicon detector SVXⅡb ○ RunⅡb Central Preshower Counter CPR2 Muon Silicon Microstrip Tracker Front End Electronics Triggers / DAQ (pipeline) Online & Offline Software

  4. Physics Results from RunⅡa (~70pb-1) • W and Z boson production cross section, decay width, Wγ production cross section • Top quark production cross section and mass • Masses and lifetimes of B-hadrons • J/ψ production cross section list

  5. W and Z production • Require two isolated energetic leptons • Negligible backgrounds • Essential for Detector Calibrations • Energy scale and resolution • ID efficiency MT Isolated energetic lepton and high missing ET Need more study for missing ET calibration ● Koji Ikado (Waseda) worked on the electron-ID and energy scale study.

  6. PDG combined Exp PDG SM Theoretical prediction Measure (ppW)(W  e)(Z) R= (ppZ)(W)(Z  ee) Extract W and Z production cross section: sB Background ~ 0.5% •B(W-->l) and •B(Z-->ll) at ECM=2TeV are consistent with standard model prediction. R = 10.54  0.18stat  0.33sys →　　Γ(W) = 2.15  0.04stat  0.07sysGeV consistent with S.M. prediction of 2.09 GeV

  7. Wγ Production • Signature • One high pT lepton • One photon (R(-l)>0.7) • High missing ET • Results consistent with SM • SM: •B(W-->l) = 18.7 ±1.3 pb ●Naho Tanimoto (Okayama) performed the muon channel analysis.

  8. Top quark pair productioncandidate event Muon Jet1 (b-tagged) Jet4 Jet2 Jet3 (b-tagged) Muon + Missing ET + 4Jets event(with 2b-tagged jets)

  9. Top quark pair production cross section • Signature (W + 3 or more jets with b-tag) • One high pT Isolated lepton • Veto Z, cosmic, conversion • Missing ET > 20 GeV • 3 or more jets with ET>15 GeV • 1 jet with secondary vertex tag • B tag improves S/B 1/6 3/1 • Find 15 candidate events in 57.5 pb-1 • Expect 3.8 ± 0.5 background events tt=5.3 ±1.9stat ±0.8syspb Theoretical prediction = 6.5 pb ●Koji Sato (Tsukuba) studied the acceptance and the secondary vertex tag. ●Soushi Tsuno (Tsukuba) worked on the study of the simulation and data comparison.

  10. Top Quark Mass • Select l +4 jet events Same as cross section, but no b tags • 33 candidate events • Method • 24 combinations in an event • 2-C fit applied, lowest 2 is chosen to get mass for each event • A continuous likelihood method is used with parameterized mass templates • Mtop is the minimum of log-likelihood distribution • Systematic uncertainty will be improved with understanding of detector

  11. Bs Lifetime; Bs J/φ CDF: largest fully reconstructed sample in the world: 74 11 events Yield/Lum. = 2 x RunI Use control channels: Bu J/ K+and Bd J/ K0* Measurement limited only by statistics

  12. First Steps towards Bs Mixing in CDF BsMixingSample BsDs(*) []  [[KK] ]  Collect more data and understand tagging BsMixingBackup Sample BsDs(*)lν []lν  [[KK] ] lν HIGH STATISTICS SAMPLE:good S/N, limited time resolution ●Satoru Uozumi (Tsukuba) is working on the Bs mixing in Bs Ds(*)lνchannel.

  13. J/ψ Production Cross Section In RunⅠ, CDF observed anomalous direct production of J/ψ and ψ(2s) in PT > 5 GeV/c which was 50 times larger than QCD theoretical prediction. In RunⅡ, CDF measured the J/ψ production cross section in the whole PT region, which is consitent with RunⅠmeasurement. ●Tomohiro Yamashita (Okayama) worked on the J/ψ reconstruction and acceptance study. s(ppgJ/y; pT>0; |h|<0.6) =240  1 (stat) 35/28(syst) nb

  14. Expected Physics Capability in RunⅡ • Bs – Bs mixing ( if xs < 25, observed at 200pb-1 ) • Masses of top quark and W boson → • Direct search for Higgs particle →

  15. Electroweak Precision Measurements Tevatron Run I : Mtop = 174.3 +- 5.1 GeV/c2 MW = 80.452 +- 0.062 GeV/c2 Run IIa EW Meas : MHiggs <193 GeV @95%CL LEP II Higgs Searches : MHiggs > 113 GeV @95%CL LEP II Hint @ MHiggs= 115 GeV RunⅡa: ΔMtop < 3 GeV/c2 ΔMW～ 30 MeV/c2 → ΔMHiggs～ 30%

  16. Higgs Search Capability at Tevatron(will be revised in this June) • MH< 130 GeV/c2 pp →WHX →ln +bb+ X • 125 < MH< 160 GeV/c2 pp →WHX →ln +W*W*+X (like-sign dilepton +jets) • 150 GeV/c2 < MH pp →HX →WW X →ln ln X (RUN2B) (RUN2A) RUN2A(～2005) exclude MH< 120 GeV/c2 at 95％ C.L. RUN2B(2005～) exclude MH< 190 GeV/c2 at 95％ C.L 3σ evidence for MH< 130 GeV/c2 or 155 GeV/c2 MH< 175 GeV/c2

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