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Improved tau polarisation measurement
ALEPH Collaboration
1996
发表期刊ZEITSCHRIFT FUR PHYSIK C-PARTICLES AND FIELDS
卷号69期号:2页码:#REF!
通讯作者Buskulic, D (reprint author), INST NATL PHYS NUCL & PHYS PARTICULES, CNRS, PHYS PARTICULES LAB, F-74019 ANNECY LE VIEUX, FRANCE.
摘要Using 22 pb(-1) of data collected at LEP in 1992 on the peak of the Z resonance, the ALEPH collaboration has measured the polarisation of the tau leptons decaying into e nu nu, mu nu nu,pi nu and a(1) nu from their individual decay product distributions. The measurement of the tau polarisation as a function of the production polar angle yields the two parameters A(tau) and A(e), where, in terms of the axial and vector couplings g(Al) and g(nu l), A(l) = 2 g(nu l) g(Al)/(g(nu l)(2) + g(Al)(2)). This analysis follows to a large extent the methods devised for the 1990 and 1991 data but with improvements which bring a better understanding of the systematic uncertainties. Combining the 1992 measurements with our previously published results yields A(tau) = 0.136 +/- 0.012 +/- 0.009 and A(e) = 0.129 +/- 0.016 +/- 0.005. Assuming e-tau universality, the measurements imply an effective weak mixing angle of sin(2) theta(W)(eff) = 0.2332 +/- 0.0014.
文章类型Article
学科领域Physics
DOI10.1007/s002880050019
收录类别SCI
WOS类目Physics, Particles & Fields
WOS记录号WOS:A1996TJ96000001
引用统计
被引频次:17[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/311005/226755
专题实验物理中心
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ALEPH Collaboration. Improved tau polarisation measurement[J]. ZEITSCHRIFT FUR PHYSIK C-PARTICLES AND FIELDS,1996,69(2):#REF!.
APA ALEPH Collaboration.(1996).Improved tau polarisation measurement.ZEITSCHRIFT FUR PHYSIK C-PARTICLES AND FIELDS,69(2),#REF!.
MLA ALEPH Collaboration."Improved tau polarisation measurement".ZEITSCHRIFT FUR PHYSIK C-PARTICLES AND FIELDS 69.2(1996):#REF!.
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