Measurements of the ϒ(1S), ϒ(2S), and ϒ(3S) differential cross sections in pp collisions at s=7TeV

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题名:	Measurements of the ϒ(1S), ϒ(2S), and ϒ(3S) differential cross sections in pp collisions at s=7TeV
作者:	余欣珊;Khachatryan, V.;Sirunyan, A.M.;Tumasyan, A.
贡献者:	理學院物理學系
关键词:	B-Physics;CMS;Cross section;Upsilon
日期:	2015-10-07
上传时间:	2026-04-23 12:29:15 (UTC+8)
出版者:	Elsevier
摘要:	摘要： Differential cross sections as a function of transverse momentum pT are presented for the production of ϒ(nS) (n = 1, 2, 3) states decaying into a pair of muons. Data corresponding to an integrated luminosity of 4.9fb−1 in pp collisions at s=7TeV were collected with the CMS detector at the LHC. The analysis selects events with dimuon rapidity \|y\|<1.2 and dimuon transverse momentum in the range 10<pT<100GeV. The measurements show a transition from an exponential to a power-law behavior at pT≈20GeV for the three ϒ states. Above that transition, the ϒ(3S) spectrum is significantly harder than that of the ϒ(1S). The ratios of the ϒ(3S) and ϒ(2S) differential cross sections to the ϒ(1S) cross section show a rise as pT increases at low pT, then become flatter at higher pT. 出版者： Elsevier 出版日期： 2015-10-07 出處： Physics letters. B, 2015-10, Vol.749 (C), p.14-34 資源來源： Elsevier ScienceDirect Journals 識別號： ISSN: 0370-2693 識別號： EISSN: 1873-2445 識別號： DOI: 10.1016/j.physletb.2015.07.037
显示于类别:	[物理學系] 期刊論文

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