1 / 37

Status and Current Results of the CDF Experiment at Fermilab

QFTHEP’03 Samara-Saratov-Volgograd June 4-11, 2003. Status and Current Results of the CDF Experiment at Fermilab. Fedor Ratnikov Rutgers, the State University of New Jersey on behalf of the CDF Collaboration. Tevatron at Fermilab. 36 36 bunches (396 ns interaction spasing). Run I best.

polster
Télécharger la présentation

Status and Current Results of the CDF Experiment at Fermilab

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. QFTHEP’03 Samara-Saratov-Volgograd June 4-11, 2003 Status and Current Results of the CDF Experiment at Fermilab Fedor Ratnikov Rutgers, the State University of New Jersey on behalf of the CDF Collaboration

  2. Tevatron at Fermilab • 3636 bunches (396 ns interaction spasing) Run I best QFTHEP'03. F. Ratnikov: CDF Results

  3. Tevatron Performance QFTHEP'03. F. Ratnikov: CDF Results

  4. CDF Detector in Run 2 QFTHEP'03. F. Ratnikov: CDF Results

  5. CDF Detector • Run I (...-1997) • Run 2 (2002-…LHC) • New • central drift chamber • double sided silicon • plug calorimeter • front-end • DAQ system • triggers • displaced track • tau QFTHEP'03. F. Ratnikov: CDF Results

  6. Data Collecting in Progress Integrated luminosity (pb-1) • Anticipate achieving L~1 fb-1 in 2005 • projection for fiscal year 2009: • “base” L ~ 4.4 fb-1 • “design” L ~ 8.6 fb-1 CDF since June 2001 Delivered ~ 300 pb-1 Recorded ~ 230 pb-1 Summer 2003 prelim. results ~ 140 pb-1 QFTHEP'03. F. Ratnikov: CDF Results

  7. Data Handling Bytes/day (read/write) • Total CDF Data on tape • 460 TB • Sustained tape IO • 5 TB/day: read • 2 TB/day: write • Data in the disk cache • dCache system, DESY • 1 TB/hour sustained reads (~300 MB/s) • This is a lot of data! • The system is pretty stable 10 TBytes/day (>100 MB/s) QFTHEP'03. F. Ratnikov: CDF Results

  8. Road Map Electroweak QCD Top Exotics B-physics LQ H++ jjexo (jet) e ID  ID  ID jet ID Si tracks B Physics (Z) (W) MET B-tag R Z (top) M(top) (Z’) (VV) M(W) SUSY MSSM Higgs SM Higgs BS mixing QFTHEP'03. F. Ratnikov: CDF Results

  9. Inclusive Jet Cross Section • Highest ET jets ever • extending Run I reach by 150 GeV • Have reduced systematic error from 5% to 3% since winter 2003 • Better  coverage • Understanding jet cross section is cornerstone of doing physics at CDF QFTHEP'03. F. Ratnikov: CDF Results

  10. Highest ET Jets Ever Seen on Accelerator QFTHEP'03. F. Ratnikov: CDF Results

  11. Inclusive Jet Cross Section vs NLO QCD • Theoretical error dominated by PDF’s • Data currently agrees with NLO prediction within estimated errors QFTHEP'03. F. Ratnikov: CDF Results

  12. W Cross Section (e, ,  channels) (t)? W We W QFTHEP'03. F. Ratnikov: CDF Results

  13. Z Cross Section, R, (W) measure NNLO LEP Ze+e- Z+- QFTHEP'03. F. Ratnikov: CDF Results

  14. VVV Coupling: W and Z Production •  and e modes • Central , ET ()> 7 GeV • R(lepton, ) > 0.7 133 seen 141 expected Br (W) = 17.22.2(stat) 2.0(sys) 1.1(lumi) pb Br (Z) = 5.81.0(stat) 0.4(sys) 0.4(lumi) pb • In agreement with SM QFTHEP'03. F. Ratnikov: CDF Results

  15. VVV Coupling: WW • Opposite-charge, high pT iso lepton (, e) pair • ETmiss > 25 GeV • ... • 5 events seen • 9.2 events expected • In agreement with SM prediction QFTHEP'03. F. Ratnikov: CDF Results

  16. Top Physics • Br (tWb) = 100% • W’s decay modes are used to classify the final states: • Dilepton (, e) 5% • Lepton () + jets 30% • All jets 44% QFTHEP'03. F. Ratnikov: CDF Results

  17. B hadrons travel Lxy~3mm befor decay with large charged track multiplicity Use b quarks semi-leptonic decays Distinguish from W/Z leptons: softer pT spectrum less isolated B tagging Silicon Vertex Tag Soft Lepton Tag QFTHEP'03. F. Ratnikov: CDF Results

  18. Top Cross Section: Dileptons • two high pT iso lepton (, e) • two jets • ETmiss > 25 GeV • HT=ET > 200 GeV QFTHEP'03. F. Ratnikov: CDF Results

  19. Double b-tagged Dilepton Event 69.7 QFTHEP'03. F. Ratnikov: CDF Results

  20. Top Cross Section: Lepton+Jets • one high pT iso lepton (, e) • Njets  4 • ETmiss > 25 GeV • HT=ET > 200 GeV • Suffers from W+jets background QFTHEP'03. F. Ratnikov: CDF Results

  21. Top Mass • Top mass is a fundamental SM parameter • directly reflects ttH coupling • important for radiative corrections QFTHEP'03. F. Ratnikov: CDF Results

  22. Top Mass lepton + b-tagged jet dileptons QFTHEP'03. F. Ratnikov: CDF Results

  23. Top Mass • mW/mtop constrains could be an evidence for new physics! QFTHEP'03. F. Ratnikov: CDF Results

  24. Higgs@Tevatron: '03 Study preliminary • '98-'99 studies were very good approximation (~20%) • with L~4-5 fb-1 CDF+D0 would exclude SM Higgs if not there up to mh~130 GeV/c2 • For L~8-10 fb-1 might find a 3 evidence No systematics included! QFTHEP'03. F. Ratnikov: CDF Results

  25. Signals Are not Dramatic Though • Need to control background shapes very accurately QFTHEP'03. F. Ratnikov: CDF Results

  26. Tau in Run 2 Dedicated triggers h + MET h + lepton (e, ) di-h Z study under way Clear tau signature H search soon MSSM Higgs and Taus Hadronic  track multiplicity (hcase) M(+l+MET) (ehcase) QFTHEP'03. F. Ratnikov: CDF Results

  27. Search for H++ H He Hee • H++ appear in SU(2)LSU(2)R broken by Higgs triplet and others • Use same sign leptons (e and/or ) • M(H) > 110 GeV/c2 ( ande channels) QFTHEP'03. F. Ratnikov: CDF Results

  28. Exotics in Dijets? Look for narrow resonance in dijet mass • ??? • No resonance found QFTHEP'03. F. Ratnikov: CDF Results

  29. Scalar Leptoquarks QFTHEP'03. F. Ratnikov: CDF Results

  30. Z’ and RS Gravitons • Search for high mass opposite sign dilepton pairs • Assume narrow resonance QFTHEP'03. F. Ratnikov: CDF Results

  31. Z’ and RS Graviton Mass Limits e+e- and +- combined QFTHEP'03. F. Ratnikov: CDF Results

  32. B-Physics Secondary Vertex B Lxy PT(B)  5 GeV Primary Vertex Lxy  450m d = impact parameter • Big brunch of CDF physics • Dedicated triggers: • J/ - e+e-, +- • effective up to PT=0 • lepton + displaced tracks • 2  displaced tracks • L1: high PT • L2: large d0 35m  33 m resol  beam  s = 48mm -500 -250 0 250 500 SVT impact parameter (mm) QFTHEP'03. F. Ratnikov: CDF Results

  33. B-Physics: Masses • Measure masses using fully reconstructed BJ/X modes • B+ and B0 consistent with world average. • Bs and bmeasurements are world’s best: • M(b)=5620.4 2.0 MeV/c2 • M(Bs)=5365.50 1.60 MeV/c2 QFTHEP'03. F. Ratnikov: CDF Results

  34. B-Physics: b decays • Use MC to parameterize the shape • Data to normalize the amplitude • Dominant backgrounds are real heavy flavor • proton particle ID (dE/dx) improves S/B Fitted signal: Measure: New Result ! BR(b c) = (6.0 1.0(stat)  0.8(sys)  2.1(BR) ) 10-3 QFTHEP'03. F. Ratnikov: CDF Results

  35. BS Yields: BsDS+ BsDswith Ds + and KK+ • Br(Bs Ds) = ( 4.8 1.2(stat) 1.8(Br) 0.8(sys) 0.6(fs/fd) 10-3 • Previous limit from OPAL: Br(Bs Ds) < 0.13 QFTHEP'03. F. Ratnikov: CDF Results

  36. Bs mixing perspectives key Issues: tagging flavour... ...correctly • Current detector performance • hadronic mode only • signal: 1600 events/fb-1 • S/B: 2/1 • D2: 4% • t = 67fs • 2 sensitivity for ms=15ps-1: ~0.5fb-1 of data • With “modest” improvements • signal: 2000 events/fb-1 • improve trigger, reconstruct more modes • S/B: 2/1 • D2: 5% • kaon tagging • t = 50fs • event-by-event tagging, L00 • 5 sensitivity for ms=18ps-1: ~1.7fb-1 of data • 5 sensitivity for ms=24ps-1: ~3.2fb-1 of data • ms=24ps-1 “covers” the expected region based upon indirect fits “same-side” tagging • Very challenging measurement • CDF is working hard on it QFTHEP'03. F. Ratnikov: CDF Results

  37. Summary • CDF has improved detector on improved machine • Has exceeded statistics and abilities of Run I • Continuing to explore QCD, EWK, Top, B, Exotics • Many brand new results • only a fraction of results was covered in this talk • Much more is coming • Ready for BS mixing and Higgs • providing Tevatron is doing well QFTHEP'03. F. Ratnikov: CDF Results

More Related