Proton-antiproton suppression in 200A GeV Au-Au collisions

作     者：Thorsten Renk Kari J. Eskola 

作者机构：Univ Jyvaskyla Dept Phys FIN-40014 Jyvaskyla Finland Univ Helsinki Helsinki Inst Phys FIN-00014 Helsinki Finland 

出 版 物：《Physical Review C》 (物理学评论C辑：核物理学)

年 卷 期：2007年第76卷第2期

页      面：027901-027901页

核心收录：

学科分类：07[理学] 070202[理学-粒子物理与原子核物理] 0702[理学-物理学] 

主　　题：FRAGMENTATION FUNCTIONS HADRON SPECTRA 

摘      要：We discuss the measured nuclear suppression of p+p¯ production in 200A GeV Au-Au collisions at the Relativistic Heavy Ion Collider (RHIC) within radiative energy loss. For the Albino-Kniehl-Kramer (AKK) set of fragmentation functions, proton production is dominated by gluons, giving rise to the expectation that the nuclear suppression for p+p¯ should be stronger than for pions due to the stronger coupling of gluons to the quenching medium. Using a hydrodynamical description for the soft matter evolution, we show that this is indeed seen in the calculation. However, the expected suppression factors for pions and protons are sufficiently similar that a discrimination with present data is not possible. In the high pT region above 6 GeV where the contributions of hydrodynamics and recombination to hadron production are negligible, the model calculation is in good agreement with the data on p+p¯ suppression.