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IVth LHC Symposium, May 1-3, FermilabJianming Qian, University of Michigan Snapshot of Tevatron collider CDF detector DØ detector & First Run II.

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Presentation on theme: "IVth LHC Symposium, May 1-3, FermilabJianming Qian, University of Michigan Snapshot of Tevatron collider CDF detector DØ detector & First Run II."— Presentation transcript:

1 IVth LHC Symposium, May 1-3, 2003 @ FermilabJianming Qian, University of Michigan Snapshot of Tevatron collider CDF detector DØ detector & First Run II results

2 IVth LHC Symposium, May 1-3, 2003 @ FermilabJianming Qian, University of Michigan Tevatron Complex Main injector (150 GeV proton storage ring) replaces main ring New permanent magnet storage ring for pbar accumulation (under commissioning) Increased center-of-mass energy (1.8  1.96 TeV) More bunches (6  36, 396 ns crossing time) Higher luminosity Run 2 goal: 3 - 4E32 cm -2 s -1 Run 2 maximum: 4.1E31 cm -2 s -1 (to date) Run 1 maximum: 2.4E31 cm -2 s -1 New for Run II:

3 IVth LHC Symposium, May 1-3, 2003 @ FermilabJianming Qian, University of Michigan Integrated Luminosity

4 IVth LHC Symposium, May 1-3, 2003 @ FermilabJianming Qian, University of Michigan Peak Luminosity

5 IVth LHC Symposium, May 1-3, 2003 @ FermilabJianming Qian, University of Michigan Luminosity Goals Short term >200 pb -1 by Sept. 2003 Long term ~ 9-15 fb -1 by Sept. 2009 (The plan is currently being reviewed, a revised plan will be submitted to DOE on June 1, 2003)

6 IVth LHC Symposium, May 1-3, 2003 @ FermilabJianming Qian, University of Michigan Short-Term Plan Accumulator bands 2&3 equalizers (5/2003) AP3 beamline (6/2003) Main injector longitudinal dampers (7/2003) F0 Lambertson lamination shielding (summer shutdown) Stacking upgrade …… Operation reliability improvement No silver bullet, a number of projects are being worked on... Fuzzy math adds up… A number of small improvements A factor of ~ 2 increase in luminosity A six week shutdown starting late July for Recycler vacuum, electron-cooling construction, A0 modification, Tevatron collimator, …

7 IVth LHC Symposium, May 1-3, 2003 @ FermilabJianming Qian, University of Michigan Long-Term Goal Luminosity limitations: pbar rate (~x5) protons on target (x2) pbar acceptance increase (x2-2.5) …… several small improvements (~x2) Compared to now x5 x5.8 Phased upgrades while operating and increasing luminosity Limit shutdowns: < 6 weeks per summer ~ 6 months for detector upgrade Dropped: 132 ns operation pbar recycling from Tevatron

8 IVth LHC Symposium, May 1-3, 2003 @ FermilabJianming Qian, University of Michigan CDFII Detector Retained from Run I Solenoid (1.4 Tesla) Central calorimeters Central muon detectors New in Run II Tracking system Silicon vertex detector (SVXII) Intermediate silicon layers Central outer tracker (COT) End plug calorimeter Intermediate muon detectors Time of flight system Front-end electronics Trigger system DAQ system

9 IVth LHC Symposium, May 1-3, 2003 @ FermilabJianming Qian, University of Michigan Trigger and DAQ Calorimeter energy Central tracker Muon stubs Cal Energy-track match E/P, EM shower max Silicon secondary vertex Multi object triggers Farm of PC’s running fast versions of Offline Code  more sophisticated selections Rate at L ~ 3E31 cm -2 s -1 12 kHz 250 Hz 50 Hz Data on tape: ~ 160+ pb -1 (including commissioning data)

10 IVth LHC Symposium, May 1-3, 2003 @ FermilabJianming Qian, University of Michigan Track and Vertex Triggers XFT: uses COT axial to find high pT tracks at L1  p T /p T = 1.65% p T (GeV/c) SVT: uses L1 XFT and SVXII Impact Parameter at L2  = 50  m = 43  m (reso)  25  m (beam)  Trigger b and c in hadronic decays

11 IVth LHC Symposium, May 1-3, 2003 @ FermilabJianming Qian, University of Michigan Tracker Performance  p T /p T = 0.13% p T (GeV/c) Power of B ℓ 2 (~2 T m 2 )

12 IVth LHC Symposium, May 1-3, 2003 @ FermilabJianming Qian, University of Michigan DØ Run II Detector New for Run II Magnetic tracker 2 Tesla solenoid Silicon microvertex tracker Scintillating fiber tracker Preshower detectors Forward muon detector Forward proton detector Front-end electronics Trigger and DAQ Retained from Run I LrAr calorimeter Central muon detector Muon toroid

13 IVth LHC Symposium, May 1-3, 2003 @ FermilabJianming Qian, University of Michigan Trigger and DAQ Level 1 Level 2 Level 3 Tape Spec. 5 kHz 1 kHz 50 Hz Operating 1.3 kHz 600 Hz 50 Hz Track and vertex triggers integration underway DAQ efficiency improved significantly, running routinely at ~85% now…

14 IVth LHC Symposium, May 1-3, 2003 @ FermilabJianming Qian, University of Michigan Vertexing Performance ~91% channels alive IP SV Jet 1  - MTC IP SV Jet 2  +jets top candidate Silicon Microvertex Detector (SMT)

15 IVth LHC Symposium, May 1-3, 2003 @ FermilabJianming Qian, University of Michigan B d  J/  K s 0 Tracking Performance ~ 40 pb -1 J/  B ℓ 2 ~ 0.5 T m 2

16 IVth LHC Symposium, May 1-3, 2003 @ FermilabJianming Qian, University of Michigan Many Preliminary Results Top quark physics Re-discovered the top quark, preliminary studies on properties, … Electroweak W/Z productions, di-boson production, e+e- forward-backward asymmetry, … New phenomena searches Higgs bosons, supersymmetry, leptoquark, large extra dimensions, Z’, … Heavy flavor resonance reconstructions, masses, lifetimes, branching fractions, rare decays, … QCD jet structure, inclusive jet cross section, dijet mass distribution, … Please see the talks by M. Bishai, G. Borissov, C. Gerber, G. Veramendi for details

17 IVth LHC Symposium, May 1-3, 2003 @ FermilabJianming Qian, University of Michigan W/Z Production Ideal for calibration and precision measurements Simple event topologies Easy trigger and identification High rate and small background CDF DØ Standard candle for high pT

18 IVth LHC Symposium, May 1-3, 2003 @ FermilabJianming Qian, University of Michigan W/Z Cross Section C. R. Hamberg, W.L. van Neerven and T. Matsuura, Nucl. Phys. B359 (1991) 343

19 IVth LHC Symposium, May 1-3, 2003 @ FermilabJianming Qian, University of Michigan Tau Identification Benefits and Challenges: The “missing” charged lepton Important for Higgs and supersymmetry searches Large backgrounds from jets, difficult to identify Learning from clean processes W , Z  ℓh DØ: Z  eh

20 IVth LHC Symposium, May 1-3, 2003 @ FermilabJianming Qian, University of Michigan Top Quark Physics Production/Decay ℓ DØ Dilepton events Background: Br~5% b-jet ℓ ℓ Br~30% Lepton+jets events Background: W+jets, fakes b-jet jet ℓ b-jet tagging: long lifetime (CDF) semi-leptonic decays (CDF, DØ) CDF ~45%/event

21 IVth LHC Symposium, May 1-3, 2003 @ FermilabJianming Qian, University of Michigan Top Pair Cross Section luminosit y dileptonlepton+jets CDF 79 pb -1 57.5 pb -1 DØ 33-48 pb -1 40-50 pb -1 DØ Run II Preliminary

22 IVth LHC Symposium, May 1-3, 2003 @ FermilabJianming Qian, University of Michigan First Look at m top CDF made a preliminary measurement of the top quark mass using the likelihood method Consistent with CDF/DØ combined Run I results and with the recently improved DØ Run I result (without using b-tagging information)

23 IVth LHC Symposium, May 1-3, 2003 @ FermilabJianming Qian, University of Michigan Large Extra Dimensions DØ has searched for LED in diem (~50 pb -1 ) and dimuon (~30 pb -1 ) final state The existence of LED will modify both mass and angular distributions DØDØ MSMS Run I: 1.37 0.97 TeV

24 IVth LHC Symposium, May 1-3, 2003 @ FermilabJianming Qian, University of Michigan

25 IVth LHC Symposium, May 1-3, 2003 @ FermilabJianming Qian, University of Michigan Inclusive Jets Production Both CDF and DØ have shown preliminary results on inclusive jet cross section. The results agree well with theoretical predictions. The errors are dominated by jet energy scale uncertainty Jet energy resolution

26 IVth LHC Symposium, May 1-3, 2003 @ FermilabJianming Qian, University of Michigan Dijet Mass Distribution Dijet mass distribution is a tool for QCD test and is also sensitive to high mass resonances. Both CDF and DØ have measured dijet cross section in Run II. The distributions agree well with the expectations. Dijet Mass: 1364 GeV CDF high mass dijet event

27 IVth LHC Symposium, May 1-3, 2003 @ FermilabJianming Qian, University of Michigan Heavy Flavor at CDF Huge cross sections, lots of particles, many topics, … BR(D o ->  +   ) < 3.1 x10 -6 95% CL First Run II physics paper submitted M(D s -D + ) = 99.28 + 0.43(stat) + 0.27(syst) MeV/c 2

28 IVth LHC Symposium, May 1-3, 2003 @ FermilabJianming Qian, University of Michigan Heavy Flavor at DØ New in the game, but is catching up quickly… Expect a lot more for the summer…  = 1.76  0.24 (stat) ps B   J/  K  B s  J/    b  J/  

29 IVth LHC Symposium, May 1-3, 2003 @ FermilabJianming Qian, University of Michigan Run II Physics Program Each gain in luminosity yields a significant increase in physics reach and lays the foundation for the next step. We are producing interesting physics now and look forward to new challenges and opportunities in the future It is a program! Jianming Qian, University of Michigan

30 IVth LHC Symposium, May 1-3, 2003 @ FermilabJianming Qian, University of Michigan Summary Collider Tevatron is a complex and old machine, it takes time Started slower than we’d like, but making progress Expect to deliver well over 200 pb -1 this year Slow start… Strong finish ! Detector Both CDF and DØ detectors are working well Both are taking physics data with high efficiencies Physics Impressive first results, harbinger of broader physics potential Expect results from data samples of 100+ pb -1 this summer Many measurements will supercede those of Run I

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