Abstract

Results are presented from measuring nuclear modification factors R_AA of the π⁰, η, K_S, and ω mesons produced in systems of Cu + Au and U + U collisions at cms energies of \(\sqrt {{{s}_{{NN}}}} \) = 200 and 192 GeV, respectively, in the PHENIX experiment at the Relativistic Heavy Ion Collider (RHIC). The R_AA values are found not to depend on the type of neutral meson and to vary in the ~0.4–0.6 and ~0.2–0.3 intervals for central Cu + Au and U + U collisions, respectively. The mean R_AA values for different collision systems (Au + Au, Cu + Cu, Cu + Au, and U + U) are found to coincide within the measuring errors when estimated at comparable values of collision energy \(\sqrt {{{s}_{{NN}}}} \), and of the number of nucleons participating in a nucleus–nucleus collision, N_part.

中文翻译：

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平均速度范围内超相对论性Cu + Au和U + U碰撞中产生轻中子介子

摘要

结果从测量核修改因子呈现ř _AA的π的⁰，η，ķ_小号，并在CMS能量在铜+金和U + U碰撞的系统中产生的ω介子\（\ SQRT {{{S} _ { {NN}}}} \） = 200和192 GeV，分别在相对论重离子对撞机（RHIC）进行的PHENIX实验中。的[R _AA值被发现不依赖于中性介子的类型和在〜0.4-0.6和0.2-0.3〜间隔中心Cu +的Au和U + U碰撞，分别以改变。平均值R _AA当在可比较的碰撞能量值\（\ sqrt {{{s} _ {}下估算时，发现不同碰撞系统（Au + Au，Cu + Cu，Cu + Au和U + U）的值在测量误差内一致。 {NN}}}} \），以及参与核－核碰撞的核子数量N_部分。