and production at forward rapidity in + collisions at GeV

=510GeVでの陽子-陽子衝突における前方ラピディティでのおよび生成

Acharya, U. 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353名*

Acharya, U. A.*; Hasegawa, Shoichi; Imai, Kenichi*; Nagamiya, Shoji*; Sako, Hiroyuki; Sato, Susumu; Tanida, Kiyoshi; PHENIX Collaboration*; 353 of others*

The PHENIX experiment at the Relativistic Heavy Ion Collider has measured the differential cross section, mean transverse momentum, mean transverse momentum squared of inclusive and cross-section ratio of to at forward rapidity in collisions at GeV via the dimuon decay channel. Comparison is made to inclusive cross sections measured at GeV and 2.76 - 13 TeV. The result is also compared to leading-order nonrelativistic QCD calculations coupled to a color-glass-condensate description of the low- gluons in the proton at low transverse momentum () and to next-to-leading order nonrelativistic QCD calculations for the rest of the range. These calculations overestimate the data at low . While consistent with the data within uncertainties above GeV/, the calculations are systematically below the data. The total cross section times the branching ratio is BR GeV/) = 54.3 0.5 (stat) 5.5 (syst) nb.