HAL : in2p3-00375987, version 1
 arXiv : 0904.1722
 Physics Letters B 683 (2010) 123-128
 System size dependence of associated yields in hadron-triggered jets
 STAR Collaboration(s)
 (2010)
 We present results on the system size dependence of high transverse momentum di-hadron correlations at $\sqrt{s_{NN}}$ = 200 GeV as measured by STAR at RHIC. Measurements in d+Au, Cu+Cu and Au+Au collisions reveal similar jet-like correlation yields at small angular separation ($\Delta\phi\sim0$, $\Delta\eta\sim0$) for all systems and centralities. Previous measurements have shown that the away-side yield is suppressed in heavy-ion collisions. We present measurements of the away-side suppression as a function of transverse momentum and centrality in Cu+Cu and Au+Au collisions. The suppression is found to be similar in Cu+Cu and Au+Au collisions at a similar number of participants. The results are compared to theoretical calculations based on the parton quenching model and the modified fragmentation model. The observed differences between data and theory indicate that the correlated yields presented here will provide important constraints on medium density profile and energy loss model parameters.
 Thème(s) : Physique/Physique Nucléaire Expérimentale
 Mot(s)-clé(s) : parton energy loss – jet quenching – di-hadron fragmentation function – relativistic heavy-ion collisions
 Lien vers le texte intégral : http://fr.arXiv.org/abs/0904.1722
 in2p3-00375987, version 1 http://hal.in2p3.fr/in2p3-00375987 oai:hal.in2p3.fr:in2p3-00375987 Contributeur : Dominique Girod <> Soumis le : Jeudi 16 Avril 2009, 14:42:57 Dernière modification le : Mardi 10 Avril 2012, 11:42:53