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HK: Fachverband Physik der Hadronen und Kerne
HK 13: Physik mit schweren Ionen
HK 13.1: Gruppenbericht
Montag, 10. März 2008, 16:30–17:00, 2E
High-pT Particle Spectra at PHENIX – A Way to Study Parton Energy Loss — •Baldo Sahlmüller for the PHENIX collaboration — Institut für Kernphysik, Universität Münster
The PHENIX experiment has measured the spectra of hadrons such as the π0 up to transverse momenta of pT = 20 GeV/c. By measuring these particle spectra and by calculating the corresponding suppression patterns at different energies, in different collision systems, and - in non-central heavy ion events - at different angles w.r.t. the reaction plane, the data can be used to characterize parton energy loss by its energy, collision system and path length dependence. The high statistics acquired in the 2004 Au+Au run leads to reduced statistical (and systematic) uncertainties and can thus be
used to constrain theoretical parameters in parton energy loss models, such as the initial gluon density
dNg/dy and the transport coefficient q.
In this talk, we will present the latest results on the suppression of high-pT π0’s and η’s in Au+Au at √sNN = 200 GeV as well as at 62.4 GeV, and in Cu+Cu at 22.4, 62.4, and 200 GeV. To examine the path length dependence, we also measure the suppression as a function of the angle w.r.t. the reaction plane in non-central Au+Au collisions. Finally, the results will be confronted with expectations from partonic energy loss models.