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QWG Sept 20-22, Jundong Huang Indiana University 1 DØ Quarkonium Production at DØ Jundong Huang Indiana University Quarkonium Workshop FermiLab September 20-22, 2003
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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
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QWG Sept 20-22, Jundong Huang Indiana University 3 Calorimeters Tracker Muon System Beamline Shielding Electronics protons 20 m antiprotons The Run II DØ Detector
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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
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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
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QWG Sept 20-22, Jundong Huang Indiana University 6 Luminosity: 114 pb -1 J/ Signal= 290k events Mass= 3.072 GeV/c 2 Width = 74 MeV/c 2, Signal J/ , (2s) Signal (2s) = 8222 events Mass= 3.668 GeV/c 2 Width = 71 MeV/c 2 DZero is reprocessing the data with improved tracking. This will increase the J/ efficiency.
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QWG Sept 20-22, Jundong Huang Indiana University 7 c signals c signals Requirements: M(dimu)-M(J/ ) <0.2GeV p T ( )>1 GeV p T (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
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QWG Sept 20-22, Jundong Huang Indiana University 8 conversion vertices
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QWG Sept 20-22, Jundong Huang Indiana University 9 Inclusive B Lifetime Inclusive B J/ + X Lifetime Measure inclusive B lifetime Separation of prompt and non-prompt J/ production ~18% J/ from B decays
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QWG Sept 20-22, Jundong Huang Indiana University 10 B (1) B J/ + X Signals (1) B d J/ K s 0 B d J/ K* B J/ K
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QWG Sept 20-22, Jundong Huang Indiana University 11 B (2) B J/ + X Signals (2) B s J/ b J/
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QWG Sept 20-22, Jundong Huang Indiana University 12 DØ 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
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QWG Sept 20-22, Jundong Huang Indiana University 13 ~30% systematic uncertainty 4.8 pb -1 of data Region not measured in Run I Run II J/ production cross section Summer 2002 Results
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QWG Sept 20-22, Jundong Huang Indiana University 14 Examples of mass plots p T 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: p T >3.0 GeV; | |<1.8 3 layer muon tracks matched to central track with at least two silicon hits Muon isolation cuts Upsilon(nS) signals Rapidity pTpT
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QWG Sept 20-22, Jundong Huang Indiana University 15 Upsilon(1S) fitted signal width fitted signal width in 0.6<|y|<1.2 (1S)
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QWG Sept 20-22, Jundong Huang Indiana University 16 Upsilon(1S) differential distribution Normalized differential distribution as a function of (1S) p T in three rapidity bins. There is little variation in the shape of p T distributions with rapidity. (1S) DZero Preliminary Results
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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 DZero Preliminary(|y|<1.8) (1S)
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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
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