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首页> 外文期刊>Physics Letters, B. Nuclear Physics and High Energy Physics >Measurements of the charm jet cross section and nuclear modification factor in pPb collisions at root sNN=5.02TeV
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Measurements of the charm jet cross section and nuclear modification factor in pPb collisions at root sNN=5.02TeV

机译:Root SNN = 5.02tev的PPB碰撞中的魅力喷射截面和核改性因子的测量

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摘要

The CMS Collaboration presents the first measurement of the differential cross section of jets from charm quarks produced in proton-lead (pPb) collisions at a nucleon-nucleon center-of-mass energy of root sNN= 5.02 TeV, as well as results from charm quark jets in proton-proton (pp) collisions at root s=2.76and 5.02TeV. By comparing the yields of the pPb and pp collision systems at the same energy, a nuclear modification factor for charm jets from 55 to 400GeV/cin pPb collisions at root sNN=5.02 TeV of R-pA= 0.92 +/- 0.07 (stat) +/- 0.11(syst) is obtained. This is consistent with an absence of final-state energy loss for charm quarks in pPb collisions. In addition, the fraction of jets coming from charm quarks is found to be consistent with that predicted by PYTHIA 6 for pp collisions at root s=2.76 and 5.02TeV, and is independent of the jet transverse momentum from 55 to 400 GeV/c. (C) 2017 The Author(s). Published by Elsevier B.V.
机译:CMS协作呈现了在核心 - 核心 - 核心的质量核心的质子铅(PPB)碰撞中产生的喷气机差异差截面的第一次测量核心= 5.02 Tev,以及魅力的结果 Quark Jet在Proton-proton(PP)碰撞中的鼠标= 2.76和5.02TEV。 通过在相同能量下比较PPB和PP碰撞系统的产量,ROT = 0.92 +/- 0.07(STAT)的ROT SNN = 5.02 TEV的55至400gev / CIN PPB碰撞中的脉冲喷气机的核改性因子。 获得+/- 0.11(SYST)。 这与PPB碰撞中的魅力夸克的缺失没有最终状态能量损失一致。 此外,发现来自Charm夸克的喷射的部分与Pythia 6预测的PP碰撞在Root S = 2.76和5.02Tev的碰撞中的一致性一致,并且与从55到400 GEV / C的射流横向动量无关。 (c)2017年作者。 由elsevier b.v出版。

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