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Observation of Sequential upsilon Suppression in PbPb Collisions
CMS Collaboration
2012
发表期刊PHYSICAL REVIEW LETTERS
卷号109期号:22
通讯作者Chatrchyan, S (reprint author), Yerevan Phys Inst, Yerevan 375036, Armenia.
摘要The suppression of the individual gamma (nS) states in PbPb collisions with respect to their yields in pp data has been measured. The PbPb and pp data sets used in the analysis correspond to integrated luminosities of 150 mu b(-1) and 230 nb(-1), respectively, collected in 2011 by the CMS experiment at the LHC, at a center-of-mass energy per nucleon pair of 2.76 TeV. The gamma (nS) yields are measured from the dimuon invariant mass spectra. The suppression of the gamma (nS) yields in PbPb relative to the yields in pp, scaled by the number of nucleon-nucleon collisions, R-AA, is measured as a function of the collision centrality. Integrated over centrality, the R-AA values are 0.56 +/- 0.08(stat) +/- 0.07(syst), 0.12 +/- 0.04(stat) +/- 0.02(syst), and lower than 0.10 (at 95% confidence level), for the gamma (1S), gamma (2S), and gamma (3S) states, respectively. The results demonstrate the sequential suppression of the gamma (nS) states in PbPb collisions at LHC energies.
学科领域Physics
DOI10.1103/PhysRevLett.109.222301
收录类别SCI
语种英语
WOS类目Physics, Multidisciplinary
WOS记录号WOS:000311552100002
引用统计
被引频次:144[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.ihep.ac.cn/handle/311005/213389
专题粒子天体物理中心
作者单位中国科学院高能物理研究所
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CMS Collaboration. Observation of Sequential upsilon Suppression in PbPb Collisions[J]. PHYSICAL REVIEW LETTERS,2012,109(22).
APA CMS Collaboration.(2012).Observation of Sequential upsilon Suppression in PbPb Collisions.PHYSICAL REVIEW LETTERS,109(22).
MLA CMS Collaboration."Observation of Sequential upsilon Suppression in PbPb Collisions".PHYSICAL REVIEW LETTERS 109.22(2012).
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