Michele Gallinaro, "QCD Results at CDF" - XXXVIII Rencontres de Moriond, March 22-29, 2003 1 QCD Results at CDF Inclusive Jet Cross Section Dijet Mass.

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Presentation transcript:

Michele Gallinaro, "QCD Results at CDF" - XXXVIII Rencontres de Moriond, March 22-29, QCD Results at CDF Inclusive Jet Cross Section Dijet Mass Jet Shapes Diffractive Dijets

Michele Gallinaro, "QCD Results at CDF" - XXXVIII Rencontres de Moriond, March 22-29, Tevatron Collider Main Injector (new) Tevatron DØCDF Chicago   p source Booster C.M. energy 1.96 TeV 396 nsec bunch spacing inst. lum. 2-3 x cm - 2 sec -1 delivered 4-7 pb -1 per week goal: 12 pb -1 per week

Michele Gallinaro, "QCD Results at CDF" - XXXVIII Rencontres de Moriond, March 22-29, CDF II Detector Tracking Silicon Central Outer Tracker Time of Flight Expanded Muon Coverage Endplug Calorimeter Forward Detectors Trigger L1 Silicon L2 DAQ (132 ns)

Michele Gallinaro, "QCD Results at CDF" - XXXVIII Rencontres de Moriond, March 22-29, QCD at the Tevatron Tevatron Collider is a tool for precision tests of QCD Compare to QCD predictions Probe to small distance scales Look for new physics Higher center-of-mass energy than Run I   s = 1.96 TeV Higher jet cross section

Michele Gallinaro, "QCD Results at CDF" - XXXVIII Rencontres de Moriond, March 22-29, Jet E T Spectrum Use cone algorithm Different E T triggers Use data when trigger is 99 % efficient Excess at high jet E T in Run I

Michele Gallinaro, "QCD Results at CDF" - XXXVIII Rencontres de Moriond, March 22-29, Inclusive Jet Cross Section Continuous spectrum to higher Jet E T Run II data extends Run I results by ~ 150 GeV Largest uncertainty (~ 5 %) Systematic uncertainties

Michele Gallinaro, "QCD Results at CDF" - XXXVIII Rencontres de Moriond, March 22-29, Cross Section Fit Best fit to central jet cross section provided by CTEQ 6.1 Gluon distribution has large uncertainty in high x region

Michele Gallinaro, "QCD Results at CDF" - XXXVIII Rencontres de Moriond, March 22-29, Jet Cross Section vs  QCD sub-processes at small angles Central jets are more likely to signal new physics (hep-ph )

Michele Gallinaro, "QCD Results at CDF" - XXXVIII Rencontres de Moriond, March 22-29, Dijet Mass  Larger dijet mass events than in Run I Two highest E T jets Search for resonances

Michele Gallinaro, "QCD Results at CDF" - XXXVIII Rencontres de Moriond, March 22-29, High Dijet Mass Event Run event Dijet Mass = 1364 GeV (corr) Jet 1 E T = 666 GeV (corr)  det = 0.31 Jet 2 E T = 633 GeV (corr)  det = CDF Run 2 Preliminary

Michele Gallinaro, "QCD Results at CDF" - XXXVIII Rencontres de Moriond, March 22-29, Dijet Mass Ratio: Run II/Run I Higher jet cross section than Run I  ratio agrees with theory to ~ 10 % in rate (~ 2 % in energy scale)

Michele Gallinaro, "QCD Results at CDF" - XXXVIII Rencontres de Moriond, March 22-29, Limits on New Particles Search for new particles decaying to dijets. Fit data to background plus a narrow resonance Calculate cross section Find 95 % CL upper limit Compare with theory  set upper limits on cross section

Michele Gallinaro, "QCD Results at CDF" - XXXVIII Rencontres de Moriond, March 22-29, Jet Shapes Jets narrow at high E T Herwig/Pythia agree well with data

Michele Gallinaro, "QCD Results at CDF" - XXXVIII Rencontres de Moriond, March 22-29, Forward Physics Hard Single Diffraction Double Pomeron Exchange

Michele Gallinaro, "QCD Results at CDF" - XXXVIII Rencontres de Moriond, March 22-29, Diffractive Dijets Compare diffractive events to ND Measure diffractive structure function from R SD/ND vs x Bj Measure  p momentum loss fraction) from calorimeter information overlap events

Michele Gallinaro, "QCD Results at CDF" - XXXVIII Rencontres de Moriond, March 22-29, Ratio of SD/ND Events Ratio is independent of  interval Ratio is independent of Q 2

Michele Gallinaro, "QCD Results at CDF" - XXXVIII Rencontres de Moriond, March 22-29, Proton-Side Multiplicity (0,0) bin

Michele Gallinaro, "QCD Results at CDF" - XXXVIII Rencontres de Moriond, March 22-29, DPE Enhanced Sample Use dedicated DPE trigger (RP+J5+GapE) (0,0) bin  ~ 16,000 events (in Run I: ~ 100 evts)

Michele Gallinaro, "QCD Results at CDF" - XXXVIII Rencontres de Moriond, March 22-29, DPE: Kinematics

Michele Gallinaro, "QCD Results at CDF" - XXXVIII Rencontres de Moriond, March 22-29, Summary Inclusive jet cross section extends beyond 550 GeV Dijet mass up event up to 1364 GeV First exclusion of new particle with mass > 1 TeV Preliminary diffractive results show no Q  dependence in SD/ND Run II analyses are well underway !

Michele Gallinaro, "QCD Results at CDF" - XXXVIII Rencontres de Moriond, March 22-29, Backup Slides …TO FOLLOW…

Michele Gallinaro, "QCD Results at CDF" - XXXVIII Rencontres de Moriond, March 22-29, New Plug Calorimeter Scintillator + lead/steel (replaces gas detector) Full coverage up to |  | = 3.5 more precise measurement of forward jets

Michele Gallinaro, "QCD Results at CDF" - XXXVIII Rencontres de Moriond, March 22-29, New MiniPlug Calorimeter Liquid Scintillator + lead towerless geometry Full coverage: 3.5< |  | < 5.1 Measure very forward jet energies