Electrons from open heavy flavor decays in Cu+Cu collisions at RHIC

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Date/Time:Wednesday, 16 Oct 2013 - Friday, 18 Oct 2013
Location:A401 Zaffarano Hall
Contact:
Phone:515-294-6952
Channel:Nuclear Physics
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Dr. Nicole Apadula, State University of New York, Stony Brook

The PHENIX Collaboration at the Relativistic Heavy Ion Collider, has measured open heavy flavor production in Cu+Cu collisions at sqrt(s_NN) = 200GeV through the measurement of electrons at mid-rapidity that originate from semi-leptonic decays of charm and bottom quarks. In peripheral Cu+Cu collisions an enhanced production of electrons is observed relative to p+p collisions. Moving to more central Cu+Cu collisions, the enhancement gradually disappears and turns into a suppression. The pT and centrality dependence of RAA in Cu+Cu collisions agree quantitatively with RAA in d+Au and Au+Au collisions respectively, if compared at similar number of participating nucleons Npart. Over the system size range covered by Cu+Cu collisions PHENIX observes an apparent transition from cold nuclear matter effects dominating the nuclear modification of heavy flavor production to a regime where it is dominated by hot matter.