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首页> 外文期刊>Physics Letters, B. Nuclear Physics and High Energy Physics >Measurement of nuclear modification factors of gamma(1S)), gamma(2S), and gamma(3S) mesons in PbPb collisions at root s(NN)=5.02 TeV
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Measurement of nuclear modification factors of gamma(1S)), gamma(2S), and gamma(3S) mesons in PbPb collisions at root s(NN)=5.02 TeV

机译:γ(1s)),γ(2s)和γ(3s)中的核改性因子的测量在Root s(nn)= 5.02 tev中的PBPB碰撞中的胶乳

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The cross sections for gamma(1S), gamma(2S), and gamma(3S) production in lead-lead (PbPb) and proton-proton (pp) collisions at root s(NN) = 5.02 TeV have been measured using the CMS detector at the LHC. The nuclear modification factors, R-AA, derived from the PbPb-to-pp ratio of yields for each state, are studied as functions of meson rapidity and transverse momentum, as well as PbPb collision centrality. The yields of all three states are found to be significantly suppressed, and compatible with a sequential ordering of the suppression, R-AA(T(1S)) > R-AA(gamma(2S)) > R-AA(gamma(3S)). The suppression of gamma(1S) is larger than that seen at root s(NN) = 2.76 TeV, although the two are compatible within uncertainties. The upper limit on the R-AA of gamma(3S) integrated over p(T), rapidity and centrality is 0.096 at 95% confidence level, which is the strongest suppression observed for a quarkonium state in heavy ion collisions to date. (C) 2019 The Author(s). Published by Elsevier B.V.
机译:使用CMS测量Root-Lead(PBPB)和Root S(NN)= 5.02 TEV的铅(PBPB)和质子 - 质子(PP)碰撞中的γ(1S),γ(2S)和γ(PP)碰撞的横截面已经测量 LHC的探测器。 从每个州的产量PBPB-to-PP比率的核改性因子R-AA被研究是Meson Rapidity和横向动量的函数,以及PBPB碰撞中心。 发现所有三种状态的产量被显着抑制,并且与抑制的顺序排序,R-AA(T(1S))> R-AA(γ(2S))> R-AA(γ(3S)的顺序排序相容 )))。 抑制γ(1S)的抑制大于根S(NN)= 2.76 Tev的抑制,尽管两者在不确定因素中兼容。 γ(3S)R-AA上的上限集成在P(t),快速和中心为95%的置信水平下为0.096,这是在迄今为止重大离子碰撞中的Quarkonium状态观察到的最强抑制。 (c)2019年作者。 由elsevier b.v出版。

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