/ Experiment-Nucl arXiv:1212.3323

Medium modification of jet fragmentation in Au+Au collisions at $\sqrt{s_{NN}}=200$ GeV measured in direct photon-hadron correlations

Pages: 8

Abstract: The jet fragmentation function is measured with direct photon-hadron correlations in p+p and Au+Au collisions at sqrt(s_NN)=200 GeV. The p_T of the photon is an excellent approximation to the initial p_T of the jet and the ratio z_T=p_T^h/p_T^\gamma is used as a proxy for the jet fragmentation function. A statistical subtraction is used to extract the direct photon-hadron yields in Au+Au collisions while a photon isolation cut is applied in p+p. I_ AA, the ratio of jet fragment yield in Au+Au to that in p+p, indicates modification of the jet fragmentation function. Suppression, most likely due to energy loss in the medium, is seen at high z_T. The fragment yield at low z_T is enhanced at large angles. Such a trend is expected from redistribution of the lost energy into increased production of low-momentum particles.

Total numbers of views: 1795
Numbers of unique views: 797
Запись создана 2013-01-10, последняя модификация 2014-01-30

Внешние ссылки:
Полный текст
Оценить этот документ:

1
2
3

(Еще не рецензированная)