Physics – Nuclear Physics – Nuclear Experiment
Scientific paper
2004-11-05
J.Phys. G31 (2005) S27-S34
Physics
Nuclear Physics
Nuclear Experiment
10 pages, 7 figures Proceedings of the Hot Quarks 2004 Conference, July 18-24 2004, Taos Valley, New Mexico, USA to be publish
Scientific paper
10.1088/0954-3899/31/4/004
Recent measurements of elliptic flow (v_2) and the nuclear modification factor (R_{CP}) of strange mesons and baryons in the intermediate p_T domain in Au+Au collisions demonstrate a scaling with the number of constituent-quarks. This suggests hadron production via quark coalescence from a thermalized parton system. Measuring the elliptic flow of charmed hadrons, which are believed to originate rather from fragmentation than from coalescence processes, might therefore change our view of hadron production in heavy ion collisions. While direct v_2 measurements of charmed hadrons are currently not available, single electron v_2 at sufficiently high transverse momenta can serve as a substitute. At transverse momenta above 2 GeV/c, the production of single electrons from non-photonic sources is expected to be dominated by the decay of charmed hadrons. Simulations show a strong correlation between the flow of the charmed hadrons and the flow of their decay electrons for p_T > 2 GeV/c. We will present preliminary STAR results from our single electron v_2 measurements from Au+Au collisions at RHIC energies.
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