J/ψ production cross section and its dependence on charged-particle multiplicity in p+p collisions at √ s = 200 GeV
J/ψ production cross section and its dependence on charged-particle multiplicity in p+p collisions at √ s = 200 GeV
复制标题
J/Ï 产生截面及其对 s = 200 GeV 时 p p 碰撞中带电粒子多重性的依赖性
DOI：
10.1016/j.physletb.2018.09.029
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发表时间：
2018
影响因子：
4.4
通讯作者：
STAR合作组（白晓智和叶震宇为主要作者之一）
中科院分区：
文献类型：
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作者：
STAR合作组（白晓智和叶震宇为主要作者之一）
我们在相对论重离子对撞机（RHIC）上用STAR实验测量了质心能量为s= 200 GeV的p+ p对撞中速（| y|< 1）下包含J/ψ的产生。本文报道了0< p T< 14 GeV/c时J/ψ的微分生成截面作为横动量（p T）的函数和总截面，并与颜色蒸发模型和非相对论量子色动力学模型的计算结果进行了比较。本文首次在s= 200 GeV的p+ p碰撞中测量了3个p T区间的J/ψ相对产率与中速带电粒子多重率的关系，并与s= 7 TeV、PYTHIA8和EPOS3蒙特卡罗发生器和Percolation模型的预测结果进行了比较。
We present a measurement of inclusive J/ψ production at mid-rapidity (| y|< 1) in p+ p collisions at a center-of-mass energy of s= 200 GeV with the STAR experiment at the Relativistic Heavy Ion Collider (RHIC). The differential production cross section for J/ψ as a function of transverse momentum (p T) for 0< p T< 14 GeV/c and the total cross section are reported and compared to calculations from the color evaporation model and the non-relativistic Quantum Chromodynamics model. The dependence of J/ψ relative yields in three p T intervals on charged-particle multiplicity at mid-rapidity is measured for the first time in p+ p collisions at s= 200 GeV and compared with that measured at s= 7 TeV, PYTHIA8 and EPOS3 Monte Carlo generators, and the Percolation model prediction.