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Common Suppression Pattern of $\eta$ and $\pi^0$ Mesons at High Transverse Momentum in Au+Au Collisions at $\sqrt{S_NN}$ = 200 GeV (2006)

Abstract

Inclusive transverse momentum spectra of eta mesons have been measured within p_T = 2-10 GeV/c at mid-rapidity by the PHENIX experiment in Au+Au collisions at sqrt(s_NN) = 200 GeV. In central Au+Au the eta yields are significantly suppressed compared to peripheral Au+Au, d+Au and p+p yields scaled by the corresponding number of nucleon-nucleon collisions. The magnitude, centrality and p_T dependence of the suppression is common, within errors, for eta and pi^0. The ratio of eta to pi^0 spectra at high p_T amounts to 0.40 < R_eta/pi^0 < 0.48 for the three systems in agreement with the world average measured in hadronic and nuclear reactions and, at large scaled momentum, in e^+e^- collisions.

Publication details

Download	http://hal.in2p3.fr/in2p3-00025529/en/
Publisher	HAL - CCSd - CNRS
Contributors	Suzanne Robert
Repository	CCSd/HAL : e-articles server (based on gBUS) (France)
Keywords	Physics/Nuclear Experiment