Measurement of prompt J/psi pair production in pp collisions at root s = 7 Tev

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	Measurement of prompt J/psi pair production in pp collisions at root s = 7 Tev
	CMS Collaboration
刊名	JOURNAL OF HIGH ENERGY PHYSICS
	2014
期号	9
关键词	PSI-PSI-PRODUCTION MESON PRODUCTION
通讯作者	Khachatryan, V (reprint author), Yerevan Phys Inst, Yerevan 375036, Armenia.
英文摘要	Production of prompt J/psi meson pairs in proton-proton collisions at root s = 7 TeV is measured with the CMS experiment at the LHC in a data sample corresponding to an integrated luminosity of about 4.7 fb(-1). The two J/psi mesons are fully reconstructed via their decays into mu(+)mu(-) pairs. This observation provides for the first time access to the high-transverse-momentum region of J/psi pair production where model predictions are not yet established. The total and differential cross sections are measured in a phase space defined by the individual J/psi transverse momentum (p(T)(J/psi)) and rapidity (vertical bar y(J/psi)vertical bar): vertical bar y(J/psi)vertical bar < 1.2 for p(T)(J/psi) > 6.5 GeV/c; 1.2 < vertical bar y(J/psi)vertical bar < 1.43 for a pT threshold that scales linearly with vertical bar y(J/psi)vertical bar from 6.5 to 4.5 GeV/c; and 1.43 < vertical bar y(J/psi)vertical bar < 2.2 for p(T)(J/psi) > 4.5 GeV/c. The total cross section, assuming unpolarized prompt J/psi pair production is 1.49 +/- 0.07 (stat) +/- 0.13 (syst) nb. Different assumptions about the J/psi polarization imply modifications to the cross section ranging from -31% to +27%.
学科主题	Physics
类目[WOS]	Physics, Particles & Fields
收录类别	SCI
语种	英语
WOS记录号	WOS:000342431400001
公开日期	2016-02-25
内容类型	期刊论文
源URL	[http://ir.ihep.ac.cn/handle/311005/213788]
专题	高能物理研究所_粒子天体物理中心
作者单位	中国科学院高能物理研究所
推荐引用方式 GB/T 7714	CMS Collaboration. Measurement of prompt J/psi pair production in pp collisions at root s = 7 Tev[J]. JOURNAL OF HIGH ENERGY PHYSICS,2014(9).
APA	CMS Collaboration.(2014).Measurement of prompt J/psi pair production in pp collisions at root s = 7 Tev.JOURNAL OF HIGH ENERGY PHYSICS(9).
MLA	CMS Collaboration."Measurement of prompt J/psi pair production in pp collisions at root s = 7 Tev".JOURNAL OF HIGH ENERGY PHYSICS .9(2014).