Measurement of exclusive production in proton–proton collisions at with the ATLAS detector

	Measurement of exclusive production in proton–proton collisions at with the ATLAS detector
	ATLAS Collaboration
刊名	PHYSICS LETTERS B
	2015
卷号	749 页码:242-261
英文摘要	This Letter reports a measurement of the exclusive gamma gamma -> l(+)l(-) (l = e, mu) cross-section in proton-proton collisions at a centre-of-mass energy of 7 TeV by the ATLAS experiment at the LHC, based on an integrated luminosity of 4.6 fb(-1). For the electron or muon pairs satisfying exclusive selection criteria, a fit to the dilepton acoplanarity distribution is used to extract the fiducial cross-sections. The cross-section in the electron channel is determined to be sigma(excl)(gamma gamma -> e+e-) = 0.428 +/- 0.035 (stat.) +/- 0.018 (syst.) pbfor a phase-space region with invariant mass of the electron pairs greater than 24GeV, in which both electrons have transverse momentum p(T) > 12 GeV and pseudorapidity vertical bar eta vertical bar < 2.4. For muon pairs with invariant mass greater than 20GeV, muon transverse momentum pT> 10 GeV and pseudorapidity vertical bar eta vertical bar < 2.4, the cross-section is determined to be sigma(excl)(gamma gamma -> mu+mu-) = 0.628 +/- 0.032(stat.) +/- 0.021 (syst.) pb. When proton absorptive effects due to the finite size of the proton are taken into account in the theory calculation, the measured cross-sections are found to be consistent with the theory prediction. (C) 2015 CERN for the benefit of the ATLAS Collaboration. Published by Elsevier B.V.
学科主题	Astronomy & Astrophysics; Physics
类目[WOS]	Astronomy & Astrophysics ; Physics, Nuclear ; Physics, Particles & Fields
收录类别	SCI
WOS记录号	WOS:000361562900035
公开日期	2016-05-03
内容类型	期刊论文
源URL	[http://ir.ihep.ac.cn/handle/311005/228993]
专题	高能物理研究所_实验物理中心
推荐引用方式 GB/T 7714	ATLAS Collaboration. Measurement of exclusive production in proton–proton collisions at with the ATLAS detector[J]. PHYSICS LETTERS B,2015,749:242-261.
APA	ATLAS Collaboration.(2015).Measurement of exclusive production in proton–proton collisions at with the ATLAS detector.PHYSICS LETTERS B,749,242-261.
MLA	ATLAS Collaboration."Measurement of exclusive production in proton–proton collisions at with the ATLAS detector".PHYSICS LETTERS B 749(2015):242-261.