# Medium effects on high $\P_{T}$ particle production measured with the PHENIX experiment

Abstract : Transverse momentum $\P_{T}$ spectra measured by the PHENIX experiment at RHIC in Au + Au, d + Au and pp collisions at $\sqrt {^S{NN}} = 200 GeV$ and in Au + Au collisions at $\sqrt {^S{NN}} = 62.4 GeV$ are presented. A suppression of the yield of high $\P_{T}$ hadrons in central Au + Au collisions by a factor 4-5 at $\P_{T}>5$ is found relative to the pp reference scaled by the nuclear overlap function $(\T_{AB})$ . In contrast, direct photons are not suppressed in central Au + Au collisions and no suppression of high $\P_{T}$ particles can be seen in d + Au collisions. This leads to the conclusion that the dense medium formed in central Au + Au collisions is responsible for the suppression.
Document type :
Conference papers

http://hal.in2p3.fr/in2p3-00025491
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Submitted on : Tuesday, January 24, 2006 - 5:45:03 PM
Last modification on : Tuesday, April 20, 2021 - 12:00:12 PM

### Citation

S.S. Adler, S. Afanasiev, C. Aidala, N.N. Ajitanand, Y. Akiba, et al.. Medium effects on high $\P_{T}$ particle production measured with the PHENIX experiment. International Conference on Hard and Electromagnetic Probes of High Energy Nuclear Collisions - Hard Probes 2004, Nov 2004, Ericeira, Portugal. pp.303-310, ⟨10.1140/epjc/s2005-02324-8⟩. ⟨in2p3-00025491⟩

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