Neutral pions with large transverse momentum in d+Au and Au+Au collisions

作者：Busching H^*

来源：Journal of Physics G: Nuclear and Particle Physics , 2005, 31(4): S473-S479.

DOI：10.1088/0954-3899/31/4/058

Measurements of transverse-momentum (p(T)) spectra of neutral pions in Au+Au and d+Au collisions at root s(NN) = 200 GeV and 62.4 GeV by the PHENIX experiment at RHIC are presented. The spectra are compared to p+p reference spectra at the same root s(NN). In central Au+Au collisions at root s(NN) = 200 GeV a factor 4-5 suppression for neutral pions and charged hadrons with p(T) > 5 GeV/c is found relative to the p+p reference scaled by the nuclear overlap function < TAB >. In contrast, such a suppression of high-p(T) particles is absent in d+Au collisions independent of the centrality of the collision. To study the root s(NN) dependence of the suppression Au+Au collisions at root s(NN) = 200 GeV and 62.4 GeV are compared.

• 出版日期2005-4