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Determination of the number of light neutrino species from single photon production at LEP
L3 Collaboration
1998
发表期刊PHYSICS LETTERS B
卷号431期号:1-2页码:#REF!
通讯作者Acciarri, M (reprint author), Ist Nazl Fis Nucl, Sez Milano, Via Celoria 16, I-20133 Milan, Italy.
摘要A determination of the number of light neutrino families performed by measuring the cross section of single photon production in e(+)e(-) collision near the Z resonance is reported. From an integrated luminosity of 100 pb(-1), collected during the years 1991-94, we have observed 2091 single photon candidates with an energy above 1 GeV in the polar angular region 45 degrees < theta(gamma) < 135 degrees. From a maximum likelihood fit to the single photon cross section, the Z decay width into invisible particles is measured to be Gamma(inv) = 498 +/- 12(stat) +/- 12(sys)MeV. Using the Standard Model couplings of neutrinos to the Z, the number of light neutrino species is determined to be N-v = 2.98 +/- 0.07(stat) +/- 0.07(sys). (C) 1998 Published by Elsevier Science B.V. All rights reserved.
文章类型Article
学科领域Physics
DOI10.1016/S0370-2693(98)00519-X
收录类别SCI
WOS类目Physics, Multidisciplinary
WOS记录号WOS:000075163000028
引用统计
被引频次:21[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/311005/226893
专题粒子天体物理中心
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L3 Collaboration. Determination of the number of light neutrino species from single photon production at LEP[J]. PHYSICS LETTERS B,1998,431(1-2):#REF!.
APA L3 Collaboration.(1998).Determination of the number of light neutrino species from single photon production at LEP.PHYSICS LETTERS B,431(1-2),#REF!.
MLA L3 Collaboration."Determination of the number of light neutrino species from single photon production at LEP".PHYSICS LETTERS B 431.1-2(1998):#REF!.
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