210 articles – 1947 Notices  [english version]
 HAL : in2p3-00232571, version 1
 arXiv : 0801.4555
 Physical Review Letters 101 (2008) 162301
 Energy dependence of $\pi^0$ production in Cu+Cu collisions at $\sqrt{s_{NN}}$ = 22.4, 62.4, and 200 GeV
 PHENIX Collaboration(s)
 (2008)
 Neutral pion transverse momentum (pT) spectra at mid-rapidity (|y| < 0.35) were measured in Cu+Cu collisions at \sqrt s_NN = 22.4, 62.4, and 200 GeV. Relative to pi -zero yields in p+p collisions scaled by the number of inelastic nucleon-nucleon collisions (Ncoll) at the respective energies, the pi-zero yields for pT \ge 2 GeV/c in central Cu+Cu collisions at 62.4 and 200 GeV are suppressed, whereas an enhancement is observed at 22.4 GeV. A comparison with a jet quenching model suggests that final state parton energy loss dominates in central Cu+Cu collisions at 62.4 GeV and 200 GeV, while the enhancement at 22.4 GeV is consistent with nuclear modifications in the initial state alone.
 Thème(s) : Physique/Physique Nucléaire Expérimentale
 Lien vers le texte intégral : http://fr.arXiv.org/abs/0801.4555
 in2p3-00232571, version 1 http://hal.in2p3.fr/in2p3-00232571 oai:hal.in2p3.fr:in2p3-00232571 Contributeur : Dominique Girod <> Soumis le : Vendredi 1 Février 2008, 10:58:56 Dernière modification le : Vendredi 5 Décembre 2008, 10:24:41