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Z-PRODUCTION CROSS-SECTIONS AND LEPTON PAIR FORWARD-BACKWARD ASYMMETRIES
ALEPH Collaboration
1994
发表期刊ZEITSCHRIFT FUR PHYSIK C-PARTICLES AND FIELDS
卷号62期号:4页码:#REF!
通讯作者BUSKULIC, D (reprint author), CNRS, PHYS PARTICULES, F-74019 ANNECY LE VIEUX, FRANCE.
摘要Precise values of the Z resonance cross sections and lepton pair forward-backward asymmetries are measured from a sample of 1.3 million Z decays into hadrons and charged leptons taken with the ALEPH detector at LEP. A silicon-tungsten luminosity calorimeter was installed in ALEPH in 1992, permitting the determination of the absolute luminosity to a systematic precision of 0.15% (experimental) and 0.25% (theoretical). This is combined with a better understanding of the hadronic event selection and an improved tau pair selection. Including the ALEPH results of the past three years one obtains sigma(h)0 = (41.60 +/- 0.16) nb, and R(l) = 20.69 +/- 0.09. The corresponding number of light neutrino species is N(v) = 2.983 +/- 0.034. The lepton pair forward-backward' asymmetry is used to derive the ratio of vector to axial-vector couplings of leptons: g(V)2(M(Z)2)/g(A)2(M(Z)2) = 0.0058 +/- 0.0011. An application of these results to constrain one model with extra Z bosons is presented.
文章类型Article
学科领域Physics
收录类别SCI
WOS类目Physics, Particles & Fields
WOS记录号WOS:A1994NV08500001
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被引频次:47[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/311005/227716
专题实验物理中心
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ALEPH Collaboration. Z-PRODUCTION CROSS-SECTIONS AND LEPTON PAIR FORWARD-BACKWARD ASYMMETRIES[J]. ZEITSCHRIFT FUR PHYSIK C-PARTICLES AND FIELDS,1994,62(4):#REF!.
APA ALEPH Collaboration.(1994).Z-PRODUCTION CROSS-SECTIONS AND LEPTON PAIR FORWARD-BACKWARD ASYMMETRIES.ZEITSCHRIFT FUR PHYSIK C-PARTICLES AND FIELDS,62(4),#REF!.
MLA ALEPH Collaboration."Z-PRODUCTION CROSS-SECTIONS AND LEPTON PAIR FORWARD-BACKWARD ASYMMETRIES".ZEITSCHRIFT FUR PHYSIK C-PARTICLES AND FIELDS 62.4(1994):#REF!.
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