Physics – Nuclear Physics – Nuclear Experiment
Scientific paper
2006-03-14
Physics
Nuclear Physics
Nuclear Experiment
4 pages, 5 figures. This manuscript was sent to the organizer on 2005/03/31. To appear in the proceedings of the 5th Internati
Scientific paper
Single electrons from open heavy quarks and di-leptons from J/psi mesons have been studied systematically at RHIC/PHENIX using data from p + p, d + Au and Au + Au collisions at $\sqrt{s_{NN}}$ = 62.4 GeV, 130 GeV and 200 GeV. From the single electron study, the charm quark yield is found to scale with the number of binary collisions. This scaling has recently been confirmed using Au+Au collisions at 62.4 GeV. A new analysis shows that a high p_T suppression of single electrons is observed in Au + Au collisions at 200 GeV. This suppression suggests that heavy quarks lose significant energy in the medium. A weak rapidity dependence is seen in J/psi yields from d + Au data, which can be interpreted as a cold matter effect. We report also the results of a measurement of the spin alignment of the J/psi in the p_T range around 1.5 GeV/c.
for the PHENIX Collaboration
Tabaru Tsuguchika
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