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Measurement of the running of the electromagnetic coupling at large momentum-transfer at LEP
L3 Collaboration
2005
发表期刊PHYSICS LETTERS B
卷号623期号:1-2页码:#REF!
通讯作者Achard, P (reprint author), World Lab, FBLJA Project, CH-1211 Geneva, Switzerland.
文章类型Article
摘要The evolution of the electromagnetic coupling, alpha, in the momentum-transfer range 1800 GeV2 < -Q(2) < 21600 GeV2 is studied with about 40 000 Bhabha-scattering events collected with the L3 detector at LEP at centre-of-mass energies root s = 189-209 GeV. The running of a is parametrised as: alpha(Q(2)) = (1-C Delta alpha(Q2))/(alpha 0) where alpha(0) = alpha(Q(2) = 0) is the fine-structure constant and C = 1 corresponds to the evolution expected in QED. A fit to the differential cross section of the e(+)e(-) -> e(+)e(-) process for scattering angles in the range vertical bar cos theta vertical bar < 0.9 excludes the hypothesis of a constant value of alpha, C = 0, and validates the QED prediction with the result: C = 1.05 +/- 0.07 +/- 0.14, where the first uncertainty is statistical and the second systematic. (c) 2005 Elsevier B.V. All rights reserved.
学科领域Physics
DOI10.1016/j.physletb.2005.07.052
收录类别SCI
WOS类目Physics, Multidisciplinary
WOS记录号WOS:000232070900004
引用统计
被引频次:11[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.ihep.ac.cn/handle/311005/225585
专题粒子天体物理中心
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L3 Collaboration. Measurement of the running of the electromagnetic coupling at large momentum-transfer at LEP[J]. PHYSICS LETTERS B,2005,623(1-2):#REF!.
APA L3 Collaboration.(2005).Measurement of the running of the electromagnetic coupling at large momentum-transfer at LEP.PHYSICS LETTERS B,623(1-2),#REF!.
MLA L3 Collaboration."Measurement of the running of the electromagnetic coupling at large momentum-transfer at LEP".PHYSICS LETTERS B 623.1-2(2005):#REF!.
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