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Indications of Suppression of Excited Upsilon States in Pb-Pb Collisions at root(NN)-N-s=2.76 TeV
CMS Collaboration
2011
发表期刊PHYSICAL REVIEW LETTERS
卷号107期号:5
通讯作者Chatrchyan, S (reprint author), Yerevan Phys Inst, Yerevan 375036, Armenia.
摘要A comparison of the relative yields of Upsilon resonances in the mu(+)mu(-) decay channel in Pb-Pb and pp collisions at a center-of-mass energy per nucleon pair of 2.76 TeV is performed with data collected with the CMS detector at the LHC. Using muons of transverse momentum above 4 GeV/c and pseudorapidity below 2.4, the double ratio of the Upsilon(2S) and Upsilon(3S) excited states to the Upsilon(1S) ground state in Pb-Pb and pp collisions, [Upsilon(2S + 3S)/Upsilon(1S)](Pb-Pb) /[Upsilon 2S + 3S)/Upsilon(1S)](pp), is found to be 0.31(-0.15)(+0.19) (stat_ +/- 0.03(syst). The probability to obtain the measured value, or lower, if the true double ratio is unity, is calculated to be less than 1%.
关键词QUARK-GLUON PLASMA HEAVY DENSITY QCD
学科领域Physics
DOI10.1103/PhysRevLett.107.052302
收录类别SCI
语种英语
WOS类目Physics, Multidisciplinary
WOS记录号WOS:000293250300006
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被引频次:151[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/311005/213089
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. Indications of Suppression of Excited Upsilon States in Pb-Pb Collisions at root(NN)-N-s=2.76 TeV[J]. PHYSICAL REVIEW LETTERS,2011,107(5).
APA CMS Collaboration.(2011).Indications of Suppression of Excited Upsilon States in Pb-Pb Collisions at root(NN)-N-s=2.76 TeV.PHYSICAL REVIEW LETTERS,107(5).
MLA CMS Collaboration."Indications of Suppression of Excited Upsilon States in Pb-Pb Collisions at root(NN)-N-s=2.76 TeV".PHYSICAL REVIEW LETTERS 107.5(2011).
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