A MEASUREMENT OF tau-POLARIZATION AT LEP

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With a data sample of 86 000 Z --> tau(+)tau>(-)(gamma) events collected in 1990 through 1993 we have measured the polarization of tau-leptons as a function of the production polar angle using the following 1-prong tau decay modes: tau(-) --> e(-)<(nu)over bar>(e) nu(tau),tau(-) --> mu(-)<(nu)over bar>(mu)nu(tau), tau(-) --> pi(-)(K-)nu(tau),tau(-) --> rho(-)nu(tau) and tau(-) --> a(1)(-)nu(tau). We obtain for the ratio of vector to axial-vector weak neutral couplings for electrons gVe/gAe = 0.0791 +/- 0.0099(stat) +/- 0.0025(syst) and taus gV tau/gA tau = 0.0752 +/- 0.0063(stat) +/- 0.0045(syst) consistent with the hypothesis of e - tau universality. Assuming universality of the e - tau neutral current we determine the effective electroweak mixing angle to be sin(2) theta(W)(eff) = 0.2309 +/- 0.0016.
Publisher
ELSEVIER SCIENCE BV
Issue Date
1994
Language
English
Article Type
Article
Keywords

FERMION PAIR PRODUCTION; TAU-POLARIZATION; QED CORRECTIONS; MONTE-CARLO; Z-RESONANCE; Z-PEAK; DECAY; LEPTONS; CONSTRUCTION; PARAMETERS

Citation

PHYSICS LETTERS B, v.341, no.2, pp.245 - 256

ISSN
0370-2693
DOI
10.1016/0370-2693(94)90316-6
URI
http://hdl.handle.net/10203/82845
Appears in Collection
EE-Journal Papers(저널논문)
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