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Phi meson production in the forward/backward rapidity region in Cu+Au collisions at sqrt(s_NN)=200 GeV

The PHENIX experiment at the Relativistic Heavy Ion Collider has measured ϕ meson production and its nuclear modification in asymmetric Cu+Au heavy-ion collisions at sqrt(s_NN)=200 GeV at both forward Cu-going direction (1.2<y<2.2) and 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 ϕ meson yield integrated over 1<pT<5 GeV/c 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 d+Au collisions for these rapidities.

phi meson; Cu+Au; 200 GeV; PHENIX

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