在sqrt（s[ NN ]）= 5.02 TeV时pp和pPb碰撞的瞬时和非瞬时J/psi产生的测量
Measurement of prompt and nonprompt J/psi production in pp and pPb collisions at sqrt(s[NN]) = 5.02 TeV
摘要：
本文报道了在LHC上用CMS实验测量了质子-质子（pp）和质子-铅（pPb）碰撞中J/psi介子的产生，每个核子对的质心能量为5.02TeV。分析中使用的数据样本分别对应于pp和pPb碰撞的28个反皮巴和35个反纳米巴的积分亮度。瞬发和非瞬发J/psi介子，后者产生的衰变B介子，测量在其dimuon衰变通道。微分截面的测量范围是横向动量2 < pt < 30 GeV/c，质心快度abs（y[CM]）< 2.4（pp）和-2.87 < y[CM] < 1.93（pPb）。核修饰因子R[pPb]作为pt和y[CM]的函数进行测量。J/psi截面的小修改，观察到在pPb相对于pp碰撞。作为pt和y[CM]的函数，研究了p向和Pb向方向的J/psi生产截面比R[FB]，表明随着沉积在大伪快速性处的横向能量的增加，J/psi生产截面比R[FB]显著降低。这些结果，涵盖了广泛的运动学范围内，冷核物质的作用，及时和nonprompt J/psi生产的影响提供了新的见解。
英文摘要：
This paper reports the measurement of J/psi meson production in proton-proton (pp) and proton-lead (pPb) collisions at a center-of-mass energy per nucleon pair of 5.02 TeV by the CMS experiment at the LHC. The data samples used in the analysis correspond to integrated luminosities of 28 inverse picobarns and 35 inverse nanobarns for pp and pPb collisions, respectively. Prompt and nonprompt J/psi mesons, the latter produced from the decay of B mesons, are measured in their dimuon decay channels. Differential cross sections are measured in the transverse momentum range of 2 < pt < 30 GeV/c, and center-of-mass rapidity ranges of abs(y[CM]) < 2.4 (pp) and -2.87 < y[CM] < 1.93 (pPb). The nuclear modification factor, R[pPb], is measured as functions of both pt and y[CM]. Small modifications of the J/psi cross sections are observed in pPb relative to pp collisions. The ratio of J/psi production cross sections in p-going and Pb-going directions, R[FB], studied as functions of pt and y[CM], shows a significant decrease for increasing transverse energy deposited at large pseudorapidities. These results, which cover a wide kinematic range, provide new insight on the role of cold nuclear matter effects on prompt and nonprompt J/psi production.
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