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Heavy Flavor Production in p+p Collisions in PHENX Experiment at RHIC

Heavy Flavor Production in p+p Collisions in PHENX Experiment at RHIC. W. Xie (RBRC) for PHENIX Collaboration.  l. Motivation for Heavy Flavor measurements at RHIC. K +. e - /  -. e - /  -. e + /  +. J/ y. An very important probe for study pQCD. K -. e + /  +.  l. D 0.

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Heavy Flavor Production in p+p Collisions in PHENX Experiment at RHIC

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  1. Heavy Flavor Production in p+p Collisions in PHENX Experiment at RHIC W. Xie (RBRC) for PHENIX Collaboration

  2. l Motivation for Heavy Flavor measurements at RHIC K+ e-/- e-/- e+/+ J/y • An very important probe for study pQCD. K- e+/+ l D0 • A very important Probe for studying properties of Hot Partonic Matter and Cold Muclear Matter (See Xiaorong Wang’s talk in Heavy-ion section)

  3. Pioneering High Energy Nuclear Interaction eXperiment (460 participant from 57 institutions of 12 countries) • Maximal Set of Observables • Photons, Electrons, Muons, ID-hadrons • Highly Selective Triggering • High Rate Capability. • Rare Processes.

  4. J/Psi->ee Hadronic background E/p How PHENIX Measure Heavy Flavor • high resolution tracking and momentum measurement from Drift chamber. Good electron identification from Ring Imaging Cherenkov detector (RICH) and Electromagnetic Calorimeter (EMCal). High rate capability: powerful level-1 electron trigger

  5. J/Psi->uu J/Psi->uu How PHENIX Measure Heavy Flavor Good momentum resolution and muon identification from mID and mTrk. High rate capability: powerful level-1 dimuon trigger

  6. cocktail e+ γ e- Converter -einvariant mass Au Au Measure Open Heavy Flavor via electrons at midrapidity • Subtraction of“photonic” sources. • conversion of photons from hadron decays in material • Dalitz decays of light mesons (p0, h, w, h, f) • Converter method • Comparison of e+/- spectra with and without converter allows separation of photonic and non-photonic sources of single electrons. • measurement via -e coincidences • Yield of -e in vicinity of  mass with mixed event subtraction All 3 methods cross check each other and give consistent results

  7. Collision 2 1 3 4 5 1 : Hadrons, interacting and absorbed (98%), 2 : Charged /K's,“decaying into ”before absorber (≤1%), 3: Hadrons, penetrating and interacting(“stopped”) 4 : Hadrons, “punch-through”, 5 : Prompt , ”desired signal” Measure Open Heavy Flavor via muon at forward rapidity Tracker Absorber Identifier zcoll zcoll zcoll Collision vertex range Symbols Hadron Detector Absorber Muon

  8. Prompt electron cross section at midrapidity

  9. PRELIMINARY PRELIMINARY PRELIMINARY Prompt Muon cross section at forward rapidity

  10. J/Psi Cross Section Measurement The total cross section in p-p collisions is: 2.61+/-0.20(fit)+/-0.26(abs) µb

  11. Run3 (Y=0) J/Psi pT distribution Fitting function: A*[1+(pT/B)2]-6 <pT2>= 4.31±0.85 At midrapidity <pT2>= 2.51±0.21 at forward rapidity

  12. Run3 (Y=0) J/Psi pT distribution COM COM CSM CSM <pT2>= 4.31±0.85

  13. Phenix muon arm 1st Upsilons at RHIC ! Upsilon Measurement PHENIX accumulated ~3pb-1 p-p collision during 2005 run.

  14. S. Lebedev Future Measurement • We see Chi_c in run5 with 3pb-1 • We are expecting to accumulate a factor of 3 more luminosity in the current ongoing run6. • RHICII: • Detector Upgrade

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