208 articles – 1940 Notices  [english version]
 HAL : in2p3-00220522, version 1
 arXiv : 0801.4020
 Physical Review Letters 101 (2008) 232301
 Suppression pattern of neutral pions at high transverse momentum in Au+Au collisions at $\sqrt{s_{NN}}$ = 200 GeV and constraints on medium transport coefficients
 PHENIX Collaboration(s)
 (2008)
 For Au + Au collisions at 200 GeV we measure neutral pion production with good statistics for transverse momentum, p_T, up to 20 GeV/c. A fivefold suppression is found, which is essentially constant for 5 < p_T < 20 GeV/c. Experimental uncertainties are small enough to constrain any model-dependent parameterization for the transport coefficient of the medium, e.g. \mean(q^hat) in the parton quenching model. The spectral shape is similar for all collision classes, and the suppression does not saturate in Au+Au collisions; instead, it increases proportional to the number of participating nucleons, as N_part^2/3.
 Thème(s) : Physique/Physique Nucléaire Expérimentale
 Lien vers le texte intégral : http://fr.arXiv.org/abs/0801.4020
 in2p3-00220522, version 1 http://hal.in2p3.fr/in2p3-00220522 oai:hal.in2p3.fr:in2p3-00220522 Contributeur : Dominique Girod <> Soumis le : Lundi 28 Janvier 2008, 13:03:08 Dernière modification le : Vendredi 2 Janvier 2009, 20:10:51