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Quarkonium Production at DØ

Quarkonium Production at DØ. Jundong Huang Indiana University Quarkonium Workshop FermiLab September 20-22, 2003. Outline. The Run II DØ Detector J/ ,  (2s) signals B  J/  +X signals observed by DØ  c  J/   signal Quarkonium production at DØ : goals

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Quarkonium Production at DØ

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  1. Quarkonium Production at DØ Jundong Huang Indiana University Quarkonium Workshop FermiLab September 20-22, 2003 QWG Sept 20-22, Jundong Huang Indiana University

  2. Outline • The Run II DØ Detector • J/, (2s) signals • B  J/ +X signals observed by DØ • c  J/  signal • Quarkonium production at DØ : goals • Preliminary J/ cross section vs rapidity • Preliminary results of (1S) differential distributions • Conclusions QWG Sept 20-22, Jundong Huang Indiana University

  3. The Run II DØ Detector Calorimeters Tracker Muon System protons Beamline Shielding 20 m Electronics antiprotons QWG Sept 20-22, Jundong Huang Indiana University

  4. Muon Detector Upgrade • Muon rapidity coverage to eta of 2.0 • Comparing to RunI, shielding reduces backgrounds by 50-100x QWG Sept 20-22, Jundong Huang Indiana University

  5. Delivered and Recorded Luminosity Lepton-Photon 2003 B-physics analyses based on integrated luminosity of 114 pb-1 Summer 03 Data Sample QWG Sept 20-22, Jundong Huang Indiana University

  6. J/, (2s) Signal Luminosity: 114 pb -1 J/ Signal= 290k events Mass= 3.072 GeV/c2 Width = 74 MeV/c2 (2s)= 8222 events Mass= 3.668 GeV/c2 Width = 71 MeV/c2 DZero is reprocessing the data with improved tracking. This will increase the J/ efficiency. QWG Sept 20-22, Jundong Huang Indiana University

  7. c signals Requirements: • M(dimu)-M(J/) <0.2GeV • pT()>1 GeV • pT(J/)<10 GeV Indirect J/ production from higher charmonium states c1 andc2 seperated by ~45 MeV The ratio of c1 andc2 is a test of different quarkonium production models Luminosity: 114 pb -1 QWG Sept 20-22, Jundong Huang Indiana University

  8.  conversion vertices QWG Sept 20-22, Jundong Huang Indiana University

  9. Inclusive B  J/ + X Lifetime • Measure inclusive B lifetime • Separation of prompt and non-prompt J/ production • ~18% J/ from B decays QWG Sept 20-22, Jundong Huang Indiana University

  10. Bd J/ Ks0 Bd J/ K* B  J/ + X Signals (1) B J/ K QWG Sept 20-22, Jundong Huang Indiana University

  11. Bs J/  b J/ B  J/ + X Signals (2) QWG Sept 20-22, Jundong Huang Indiana University

  12. Quarkonium Production at DØ We intend to measure: • J/, (2S) and (nS) differential cross sections in several rapidity ranges • Charmonium prompt and non-prompt production • Quarkonium direct and indirect production • J/,(2S) and (nS) polarization QWG Sept 20-22, Jundong Huang Indiana University

  13. Run II J/ production cross section Summer 2002 Results 4.8 pb-1 of data ~30% systematic uncertainty Region not measured in Run I QWG Sept 20-22, Jundong Huang Indiana University

  14. Upsilon(nS) signals Rapidity Examples of mass plots pT bins (vertical) : 1-2 GeV; 3-4 GeV; 4-6 GeV; rapidity bins (horizontal): 0.0<|y|<0.6 (6.2k events) 0.6<|y|<1.2 (7.6k events) 1.2<|y|<1.8 (5.6k events) Requirements: • pT >3.0 GeV; ||<1.8 • 3 layer muon tracks matched to central track with at least two silicon hits • Muon isolation cuts pT QWG Sept 20-22, Jundong Huang Indiana University

  15. Upsilon(1S) fitted signal width fitted signal width in 0.6<|y|<1.2 (1S) QWG Sept 20-22, Jundong Huang Indiana University

  16. Upsilon(1S) differential distribution Normalized differential distribution as a function of (1S) pT in three rapidity bins. There is little variation in the shape of pT distributions with rapidity. (1S) (1S) (1S) DZero Preliminary Results QWG Sept 20-22, Jundong Huang Indiana University

  17. Upsilon(1S) differential distributions Comparison of Normalized differential distribution: • DØ Run II|y|<1.8 • CDF Run I |y|<0.4 (1S) (1S) DZero Preliminary(|y|<1.8) QWG Sept 20-22, Jundong Huang Indiana University

  18. Conclusion • Summer 2003 B-physics analyses based on integrated luminosity of 114 pb-1 • Over 290k J/ and 20k (1S) events reconstructed • Analyses of J/ and (1S) differential cross sections in various rapidity ranges are underway • c signals from  conversions established • We have started to study the J/, (2s) and (1S)polarization • All data are being reprocessed with better tracking QWG Sept 20-22, Jundong Huang Indiana University

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