PHOBOS Collのrapidity分布のOrnsteiir-Uhlenbek過程による解析(熱場の量子論とその応用,研究会報告)

概要

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Recently PHOBOS Collaboration has reported the pseudorapidity distribution dN_<ch>/dη in Au-Au collisions at √<^SNN>=130 GeV. To analyse them, we have assumed that produced final hadrons are governed by the damping law [numerical formula] where y, λ and f(t) mean the rapidity, the frictional coefficient and the white noise, respectively. In the high energy collisions y≈η holds. From the damping law, we have the Fokker-Planck equation called the Ornstein-Uhlenbeck process. Assuming two sources at y_B (η_B) and y_T (η_T), we can use the solutions of the Fokker-Planck equation for analyses of dN_<ch>/dη. Our analyses show that the energy of produced hadron over the range -0.5<η<0.5 with the fluctuation due to the stochastic process, ΔE [numerical formula] in dN_<ch>/dη with the centrality cut 0-6 %. Using the Bjorken's picture for the calculation of energy density near η≈0, we have the following energy density [numerical formula].
素粒子論グループ素粒子研究編集部の論文
2002-04-20