Xiaorong Wang, SQM 2006 1 Measurement of Open Heavy Flavor with Single Muons in pp and dAu Collisions at 200 GeV Xiaorong Wang for PHENIX collaboration.

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Presentation transcript:

Xiaorong Wang, SQM Measurement of Open Heavy Flavor with Single Muons in pp and dAu Collisions at 200 GeV Xiaorong Wang for PHENIX collaboration New Mexico State University Why Open Charm in pp, dAu collisions? Why with PHENIX muon arms? How to measure open charm? What have we learned?

Xiaorong Wang, SQM Motivation: why open charm? pp collisions: Provide the critical test for pQCD calculations of heavy-quark production Probe cold nuclear medium effect in dAu collisions  Gluon saturation/CGC at forward rapidity (small x) ? Different scaling at different rapidity  Coherent multiple scattering and X B rescaling ?  Recombination? Open Heavy flavor measurement will provide more constrains on these models. Open charm production serves as an appropriate normalization for J/psi production.

Xiaorong Wang, SQM PHENIX detector Electrons: central arms |η| 0.2 GeV/c Muons: muon arms GeV/c K+K+ -- e+e+ D *0 

Xiaorong Wang, SQM PHENIX muon arms “x” coverage From Eskola, Kolhinen, Vogt Nucl. Phys. A696 (2001) gluons in Pb / gluons in p X PYTHIA open charm simulation Particle production in the d direction (north) is sensitive to the small-x parton distribution in the Au nuclei; whereas in the gold (south) is sensitive to the large-x in Au

Xiaorong Wang, SQM Experimental Challenge Prompt Muons Punch-through hadrons Decay Muon

Xiaorong Wang, SQM Prompt µ background subtraction  Punch-through hadrons: Data driven method to Estimate attenuation  Decay muons: Vertex distribution analysis Analysis Techniques Decay muons Punch-through hadrons Prompt muons ? Gap2 Gap3 Gap4 Prompt+de cay muons Hadron number of tracks Muon detector   absorber   decay punch through prompt

Xiaorong Wang, SQM Sources of prompt muons (p T > 0.9GeV) (determined from Pythia) D ±  ±, …,  c +  +, B ±   ±  ±   ±  *   +  - q q   *   +  - J/ ,…   +  - , ,   +  - charge asymmetric charge symmetric

Xiaorong Wang, SQM Comparison Prompt  - pt spectrum with theory FONLL: Fixed Order next-to-leading order terms and Next-to-Leading-Log large p T resummation. FONLL and PYTHIA calculation under predicted PHENIX Data at forward rapidity, Run2pp  - FONLL: Solid line and band Without scaling the charm contribution: dotted line

Xiaorong Wang, SQM Shadowing at Forward rapidity in dAu collisions Color Glass Condense Dynamic Multiple Scattering Power Correction J. Qiu & I. Vitev D. Kharzeev & K. Tuchin hep-ph/ Power correction only CGC

Xiaorong Wang, SQM Recombination “Explains” light hadron yields in forward and backward rapidities  Input: low pT forward /backward hadron distributions Expect similar effects on open charm(?) Measurement of charm yields could provide additional constrains on these models H

Xiaorong Wang, SQM Prompt  ’s p T spectra in dAu collisions and R dAu North Arm: d going direction; South Arm: Au going direction

Xiaorong Wang, SQM Nuclear Modification Factor: R dAu (decay  from light hadrons) PHENIX Preliminary Au-going d-going Direction R dAu vs p T R dAu vs η

Xiaorong Wang, SQM Summary: FONLL and PYTHIA under predicted prompt  at forward rapidity in pp collisions at 200 GeV. For muons from open heavy flavor decay, a suppression in forward rapidity is observed. It is consistent with CGC and power correction. Results are statistically limited. The mechanism of the observed enhancement at backward rapidity needs more theoretical investigation. Anti-shadowing and recombination could lead to such enhancement. Both Muon from light meson decay and heavy flavor decay show same behavior at forward and backward direction in dAu collisions.

Xiaorong Wang, SQM Backup

Xiaorong Wang, SQM