Measurement of upsilon production in 7 TeV pp collisions at ATLAS

	Measurement of upsilon production in 7 TeV pp collisions at ATLAS
	ATLAS collaboration
刊名	PHYSICAL REVIEW D
	2013
卷号	87 期号:5
关键词	OCTET QUARKONIA PRODUCTION PROMPT J/PSI PRODUCTION ROOT-S=7 TEV HEAVY QUARKONIUM J-PSI CHARMONIUM PRODUCTION HADRONIC COLLISIONS POLARIZATION GLUONS QCD
通讯作者	Aad, G (reprint author), Univ Freiburg, Fac Math & Phys, Hugstetter Str 55, D-79106 Freiburg, Germany.
英文摘要	Using 1.8 fb(-1) of pp collisions at a center- of- mass energy of 7 TeV recorded by the ATLAS detector at the Large Hadron Collider, we present measurements of the production cross sections of Upsilon(1S,2S,3S) mesons. Upsilon mesons are reconstructed using the dimuon decay mode. Total production cross sections for p(T) < 70 GeV and in the rapidity interval vertical bar y(Upsilon)vertical bar < 2. 25 are measured to be, 8.01 +/- 0.02 +/- 0.36 +/- 0.31 nb, 2.05 +/- 0.01 +/- 0.12 +/- 0.08 nb, and 0.92 +/- 0.01 +/- 0.07 +/- 0.04 nb, respectively, with uncertainties separated into statistical, systematic, and luminosity measurement effects. In addition, differential cross section times dimuon branching fractions for Upsilon(1S), Upsilon(2S), and Upsilon(3S) as a function of Upsilon transverse momentum pT and rapidity are presented. These cross sections are obtained assuming unpolarized production. If the production polarization is fully transverse or longitudinal with no azimuthal dependence in the helicity frame, the cross section may vary by approximately +/- 20%. If a nontrivial azimuthal dependence is considered, integrated cross sections may be significantly enhanced by a factor of 2 or more. We compare our results to several theoretical models of Upsilon meson production, finding that none provide an accurate description of our data over the full range of Upsilon transverse momenta accessible with this data set. DOI. 10.1103/ PhysRevD. 87.052004
学科主题	Astronomy & Astrophysics; Physics
类目[WOS]	Astronomy & Astrophysics ; Physics, Particles & Fields
收录类别	SCI
语种	英语
WOS记录号	WOS:000315737000003
公开日期	2016-02-26
内容类型	期刊论文
源URL	[http://ir.ihep.ac.cn/handle/311005/213481]
专题	高能物理研究所_实验物理中心
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	ATLAS collaboration. Measurement of upsilon production in 7 TeV pp collisions at ATLAS[J]. PHYSICAL REVIEW D,2013,87(5).
APA	ATLAS collaboration.(2013).Measurement of upsilon production in 7 TeV pp collisions at ATLAS.PHYSICAL REVIEW D,87(5).
MLA	ATLAS collaboration."Measurement of upsilon production in 7 TeV pp collisions at ATLAS".PHYSICAL REVIEW D 87.5(2013).