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CDF: Stato dell’analisi

CDF: Stato dell’analisi. INFN - Riunione della CSN 1 Roma 17 Maggio 2004 Giovanni Punzi SNS/INFN-Pisa. SOMMARIO. Stato generale dell’analisi a CDF Top/EWK physics highlights b/c physics. CDFII data analysis. Data set 500 pb -1 delivered, 400 pb -1 on tape, ~300 pb -1 good

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CDF: Stato dell’analisi

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  1. CDF: Stato dell’analisi INFN - Riunione della CSN 1 Roma 17 Maggio 2004 Giovanni Punzi SNS/INFN-Pisa SOMMARIO • Stato generale dell’analisi a CDF • Top/EWK physics highlights • b/c physics G. Punzi, INFN-Pisa

  2. CDFII data analysis • Data set • 500 pb-1 delivered, 400 pb-1 on tape, ~300 pb-1 good • Most analyses use (Feb 02 – Sep 03) ~200pb-1 (2*RunI) • Much progress since last report in Sep 03 • Reconstruction software improvements • The flow of physics results has begun - many recent blessing • Italian group is giving key contributions • Will cover only highlights with emphasis on Italian work • Top quark • EWK • B physics G. Punzi, INFN-Pisa

  3. Italian group contributions • B/charm physics • Topics:Bhh (ACP, BR),Lbpp, BsDsp & lnDs (for Bs mixing), Bsff, BdfK*, BfK (ACP, BR), D0hh (BR, ACP), D+πππ, pentaquark search • Groups involved: Padova, Pisa, Roma, Trieste • High pt physics • Topics: Zbb, Higgs searches, top physics, hadronic top, top backgrounds, b-tagging, W+jets, forward W’s • Groups involved: Bologna, Padova (Trento), Pisa, Roma • Responsibilities: • Conveners of B and top physics group & subgroups • Important committees (e.g. Bs mixing) • Interal referees for various analyses (“godparents”) • Contributions to crucial analysis tools • Most work in close cooperation amongst Italian groups • A lot of work in close cooperation with non-Italian group G. Punzi, INFN-Pisa

  4. Basic tools: tracking NEW • Great progress in Si stand-alone • Substantial efficiency improvement at large h and low-pt • Improved mass resolution • L00 now ready for physics: • eff. 60% and growing • Clear improvement in (Lxy),crucial for Bs mixing G. Punzi, INFN-Pisa

  5. p K K  p Basic tools: PID • Improved TOF t0 (reduce tails) • Improved COT dEdx ->separation • Silicon dEdx starting up TOF: >1 K/π separationupto p=2 GeV dE/dx in COT K/π sep. >1.4@Pt>2GeV (was 1.2) 1.5 GeV/c dEdx in Silicon Vertex for low-pt tracks PLAN: combine them all ! G. Punzi, INFN-Pisa

  6. CDFII Physics Results • 5 Low-Pt papers produced • Charm cross-section, Ds-D+ mass, D0->µµ, Bs->µµ, X(3872) • First High-Pt paper submitted 27/4 • t-tbar cross section from dileptons • 23 paper drafts currently under review • 6 Low-Pt • 4 EWK • 6 Top • 5 Exotics • 2 QCD • A long list of blessed results going through internal review • Many more papers will be drafted in upcoming months G. Punzi, INFN-Pisa

  7. Hi-Pt G. Punzi, INFN-Pisa

  8. 1st Run II top paper:Top-> dileptons Flavor distribution consistent with SM expectation  = 7.0+2.4-2.1(stat) +1.6-1.1(sys) 0.4 (lumi) pb(hep-ex/0404036) G. Punzi, INFN-Pisa

  9. Top mass: l + jets • Choose events with 4 jets, 1 vertex tag • 28 events in 162 pb-1 with estimated bckg of 7.0 ± 0.8 • Syst. uncertainty dominated by jet-energy scale. Best determination from DLM: mt = 177.8 +4.5-5.0 (stat) ± 6.2 (sys) GeV G. Punzi, INFN-Pisa

  10. Run II Top Summaries Top Mass PRL submitted 04/27/04 PRD draft in preparation PRD draft in preparation PRD draft in preparation PRD draft in preparation Optimizing the mass scale. Will follow cross sections PRL Combination G. Punzi, INFN-Pisa

  11. CDF II (e)1.1<|h|<2.8 W,Z Summary • s(W,Z) • From the ratio: GW = 2071 40 (MeV/c2) First-time use of Forward region thanks to SVX+ISL Standalone tracking G. Punzi, INFN-Pisa

  12. Search for Hi-mass dileptons M(Z’) >750 GeV (RunI > 690 GeV) G. Punzi, INFN-Pisa

  13. Low-Pt G. Punzi, INFN-Pisa

  14. Bs m+m- Bd m+m- Background 1.05±0.30 1.07±0.31 Data 1 1 BR limit @95% C.L. 7.5 10-7 1.9  10-7 BR limit @90% C.L. 5.8  10-7 1.5  10-7 Rare decays: Bd(s) m+m- Best world result for Bs (improves CDF Run I x3) 1 event in the overlap region Slightly better results than Belle and BaBar for Bd • Muon Pt>1.5-3.0 GeV, |eta|<0.6 • “Blind” analysis: cuts optimized before looking at the signal region 2.0  10-7 1.6  10-7 G. Punzi, INFN-Pisa

  15. R. Dermisek et al., hep-ph/0304101 SO(10) 7.510-7 Bs m+m- implications for SUSY R. Arnowitt et al., PLB 538 (2002) 121, new plot by B.Dutta R-parity violating New limit excludes significant amounts of the previously allowed SUSY models parameters - Expect ~10-7 with 1fb-1 G. Punzi, INFN-Pisa

  16. BVV Polarization and lifetimes BsJ/ • BdJ/K*, BsJ/ • Systematics to O(1m) • Going towards s cBu = 498.19.9(stat)2.4(syst) cBd = 461.315.4(stat)2.4(syst) cBs = 410.430.0(stat)+2.4 -2.9(syst) Bu/Bd = 1.080  0.042 Bs/Bd = 0.890  0.072 BdJ/K* Competitive with PDG |A0|2 = 0.63  0.04  0.03; || : 3.07  0.40 |A|2 = 0.18  0.05  0.05; : 0.11  0.23 |A0|2 = 0.59  0.07  0.03 |A|2 = 0.23  0.10  0.01 Bd World best Bs

  17. Hadronic decays:Charm & more Charm syst A(D0 KK) = 2.0 ± 1.2± 0.6 % A(D0  pp )= 1.0 ± 1.2 ± 0.6 % • CDF is publishing the World’s best BR &ACP measurement in D0 decays • Now going for BR and ACP of D+->πππ - No experiment ever had >1500 ev • BR known at 10% will become 1% • Unique possibility to see ACP in Charm ~190 pb-1 55,000 events ! G. Punzi, INFN-Pisa

  18. Updating B->hh BR& direct ACP Bd = 160  27 BdK = 542  30 • Substantial yields in 180pb-1 • Bd yields = 80fb-1 Babar • RAW yields for the moment • Update of LP03 result at ICHEP04 BsKK = 225  29 separated by dEdx+kinematics BsK = 28  25 ACP(BdK) = -0.08  0.07 • Direct Acp(Kπ) to 7% (Babar 5%@same yield) • BR(BsKK) to 15% -> Constraints CKM (angle ) • Largest fully reconstructed Bs sample, CP eigenstate  s G. Punzi, INFN-Pisa

  19. B+K+ BR • Pure-penguin, b->sss decay • Sensitive to Vts and NP • BR & direct-ACP (180pb-1) ACP G. Punzi, INFN-Pisa

  20. Another B->sss penguin process • QCDF expectation: 3.68 10-5 First Observation ofBs ff Good S/B ! 5 significance Blind analysis, optimized according to physics/0308063 With more statistics, can get larger yields by looser cuts FUTURE: Angular analysis (yields a  measurement) G. Punzi, INFN-Pisa

  21. Welcome back Bd mixing • xd Compatible with expectation. Same Side Tagging only G. Punzi, INFN-Pisa

  22. D2 [%] CDF-II CDF-I Soft muon 0.7  0.2 Soft electron in progress e+µ 2.10.5 Jet charge 0.4  0.02 * 2.2  1.3 Same Side 1.0  0.5 2.1  0.5 Opp. side kaon in progress N/A Same side kaon in progress N/A B Flavor Tagging OST (opposite side tagging): B’s produced in pairs  tag flavor of opposite B JETQ:sign of the weighted average charge of opposite B-Jet SLT:sign of soft lepton from decay of opposite B SST (same side tagging): B0(B0)is likely to be accompanied by a+() Search for the track with minimum PTREL Kaon taggers (new in CDF): OST (K from bcs transition) SST (K from fragmentation) • Evaluation in progress, expectations between 5-10% • Learning process in runII no faster than runI... *simpler algorithm G. Punzi, INFN-Pisa

  23. Hadronic Yields for Bs mixing BR paper draft • Currently ~1.5pb of hadronic + ~1pb needing reflection cleanup Need 2pb and D2= 5% for 5 sensitivity up to 24ps-1 in 3.2 fb-1 • - xs is the most complex of all • B measurement • Need to combine many ingredients • - Ad-hoc coordination (1/2 italian) • - Italy is on the front line G. Punzi, INFN-Pisa

  24. A final note • What it is like to produce physics in this environment ? • More refined and complex analysis than in run I • Large samples, O(106) events (hadronic triggers) and need to keep up with software revisions/conference deadlines • Large CPU usage, with peaks • Large skimmed subsamples on disk • Blind analysis - Complex, multidimensional cut optimization • Precision measurements, small systematics  large control samples • realistic MC: simulate detector/trigger conditions vs time • Real data calibrations, e.g. dEdx (fit 103 parameters on 106 events) • Some analysis had smaller signal samples - but still need huge calibrations samples -> requirements are not different • Many analyses at the same time • It was all possible only thanks to italian-specific resources • “Generic” users need weeks to run through data samples It is working, and we would like to keep it that way G. Punzi, INFN-Pisa

  25. Backup G. Punzi, INFN-Pisa

  26. Pentaquark Searches at CDF (Fit excludes signal region) pK0S invariant mass spectrum G. Punzi, INFN-Pisa

  27. All-hadronic top • Counting method • Kinematic selection + 1b- tag • Observe: 326 on 264±17 background  = 7.8 ± 2.5 (stat) +4.7-2.3 (syst) pb G. Punzi, INFN-Pisa

  28. W+jets production G. Punzi, INFN-Pisa

  29. The Bc, rediscovered… CDF Run1 G. Punzi, INFN-Pisa

  30. BsKK Bd hep-ph/0404009 B to h+h'- future measurements • BsK BR/Acp measurement • Limits on Bs, BdKK • Lifetime in BsKK : s • ACP in Bd,BsKK Bs+Bd BRs’ alone provide, via U-spin simmetry, informations of  (R. Fleischer hep-ph/0306270) and checks of CKM model (Matias&London, hep-ph/0404009) Longer time-scale: time dependent ACP in BsKK measure  independently of penguin pollution (Fleischer and Matias: PRD669 (2002) 054009) G. Punzi, INFN-Pisa

  31. BVV Polarization Amplitudes BsJ/ • BdJ/K*, BsJ/ • Prerequisite for s • Test of factorization hypothesis BdJ/K* |A0|2 = 0.63  0.04  0.03; || : 3.07  0.40 |A|2 = 0.18  0.05  0.05; : 0.11  0.23 |A0|2 = 0.59  0.07  0.03 |A|2 = 0.23  0.10  0.01 Bd World best results Bs

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