meson production in the forward/backward rapidity region in Cu + Au collisions at = 200 GeV

Adare, A.*; 長谷川 勝一; 今井 憲一; 永宮 正治; 佐甲 博之; 佐藤 進; 谷田 聖; PHENIX Collaboration*; 他505名*

Physical Review C, 93(2), p.024904_1 - 024904_13, 2016/02

AA2015-1019.pdf:0.98MB

https://doi.org/10.1103/PhysRevC.93.024904

The PHENIX experiment at the Relativistic Heavy Ion Collider has measured meson production and its nuclear modification in asymmetric Cu + Au heavy-ion collisions at = 200 GeV at both forward Cu-going direction (1.2 y 2.2) backward Au-going direction (-2.2 y -1.2) rapidities. The measurements are performed via the dimuon decay channel and reported as a function of the number of participating nucleons, rapidity, and transverse momentum. In the most central events, 0% - 20% centrality, the meson yield integrated over 1 5 GeV/ prefers a smaller value, which means a larger nuclear modification, in the Cu-going direction compared to the Au-going direction. Additionally, the nuclear-modification factor in Cu + Au collisions averaged over all centrality is measured to be similar to the previous PHENIX result in + Au collisions for these rapidities.