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A MEASUREMENT OF tau-POLARIZATION AT LEP
Authors
M Acciarri
A Adams
+23 more
O Adriani
M Aguilarbenitez
S Ahlen
J Alcaraz
G Alkhazov
A Aloisio
G Alverson
M Alviggi
G Ambrosi
Q An
H Anderhub
A Anderson
V Andreev
T Angelescu
L Antonov
D Antreasyan
P Arce
A Arefiev
T Azemoon
T Aziz
P Baba
P Bagnaia
J Bakken
Publication date
1 January 1994
Publisher
Abstract
With a data sample of 86 000 Z → τ+τ-(γ) events collected in 1990 through 1993 we have measured the polarization of τ-leptons as a function of the production polar angle using the following 1-prong τ decay modes: τ-→e-vevτ, τ-→π- (K-)vτ, τ-→ρ{variant}-vτ and τ-→a1-vτ. We obtain for the ratio vector to axial-vector weak neutral couplings for electrons gVe/gAe=0.0791±0.0099(stat)±0.0025 (syst) and taus gVτ/gAτ=0.0752±0.0063 (stat)±0.0045 (syst) consistent with the hypothesis of e - τ universality. Assuming universality of the e - τ neutral current we determine the effective electroweak mixing angle to be sin2 θeffw = 0.2309 ± 0.0016. © 1994
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