ϒ(nS) polarizations versus particle multiplicity in pp collisions at s=7 TeV

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题名:	ϒ(nS) polarizations versus particle multiplicity in pp collisions at s=7 TeV
作者:	余欣珊;Khachatryan, Vardan
贡献者:	理學院物理學系
日期:	2016-10-10
上传时间:	2026-04-23 14:50:58 (UTC+8)
出版者:	United States
摘要:	摘要： The polarizations of the Y(1S), Y(2S), and Y(3S) mesons are measured as a function of the charged particle multiplicity in proton-proton collisions at √s = 7 TeV. The measurements are performed with a dimuon data sample collected in 2011 by the CMS experiment, corresponding to an integrated luminosity of 4.9 fb–1. The results are extracted from the dimuon decay angular distributions, in two ranges of Y(nS) transverse momentum (10-15 and 15-35 GeV), and in the rapidity interval \|y\| < 1.2. Furthermore, the results do not show significant changes from low- to high-multiplicity pp collisions, although large uncertainties preclude definite statements in the Y(2S) and Y(3S) cases. 出版者： United States 出版日期： 2016-10-10 出處： Physics letters. B, 2016-10, Vol.761 (C) 資源來源： Elsevier ScienceDirect Journals Complete 識別號： ISSN: 0370-2693 識別號： DOI: 10.1016/j.physletb.2016.07.065
显示于类别:	[物理學系] 期刊論文

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