15788 articles – 31777 references  [version française]
 HAL: in2p3-00025529, version 1
 arXiv: nucl-ex/0601037
 Physical Review Letters 96 (2006) 202301
 Common Suppression Pattern of $\eta$ and $\pi^0$ Mesons at High Transverse Momentum in Au+Au Collisions at $\sqrt{S_NN}$ = 200 GeV
 For the PHENIX collaboration(s)
 (2006)
 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.
 1: Laboratoire SUBATECH Nantes (SUBATECH) CNRS : UMR6457 – IN2P3 – Université de Nantes – École Nationale Supérieure des Mines - Nantes 2: Laboratoire Leprince-Ringuet (LLR) CNRS : UMR7638 – IN2P3 – Polytechnique - X 3: Institut de Physique Nucléaire d'Orsay (IPNO) CNRS : UMR8608 – IN2P3 – Université Paris XI - Paris Sud 4: Laboratoire de Physique Corpusculaire de Clermont-Ferrand (LPC-CLERMONT) CNRS : UMR6533 – IN2P3 – Université Blaise Pascal - Clermont-Ferrand II
 Subject(s) : Physics/Nuclear Experiment