HAL : in2p3-00151447, version 1
 arXiv : 0705.3238
 Physical Review C 77 (2008) 011901
 Transverse momentum and centrality dependence of dihadron correlations in Au+Au collisions at $\sqrt{s_{NN}}$=200 GeV: Jet-quenching and the response of partonic matter
 PHENIX Collaboration(s)
 (2008)
 Azimuthal angle \Delta\phi correlations are presented for charged hadrons from dijets for 0.4 < p_T < 10 GeV/c in Au+Au collisions at sqrt(s_NN) = 200 GeV. With increasing p_T, the away-side distribution evolves from a broad to a concave shape, then to a convex shape. Comparisons to p+p data suggest that the away-side can be divided into a partially suppressed "head" region centered at Delta\phi ~ \pi, and an enhanced "shoulder" region centered at Delta\phi ~ \pi +/- 1.1. The p_T spectrum for the "head" region softens toward central collisions, consistent with the onset of jet quenching. The spectral slope for the "shoulder" region is independent of centrality and trigger p_T, which offers constraints on energy transport mechanisms and suggests that the "shoulder" region contains the medium response to energetic jets.
 Thème(s) : Physique/Physique Nucléaire Expérimentale
 Lien vers le texte intégral : http://fr.arXiv.org/abs/0705.3238
 in2p3-00151447, version 1 http://hal.in2p3.fr/in2p3-00151447 oai:hal.in2p3.fr:in2p3-00151447 Contributeur : Dominique Girod <> Soumis le : Lundi 4 Juin 2007, 13:27:18 Dernière modification le : Mardi 8 Janvier 2008, 13:51:04