The polarization of tau leptons produced in the reaction e+ e- at the Z resonance has been measured using the tau decay modes e nu_e nu_tau, mu nu_mu nu_tau, pi nu_tau, rho nu_tau and a_1 nu_tau. The mean value obtained is P_tau = -0.152 +/- 0.045, indicating that parity is violated in the neutral current process e+e- ->tau+tau-. The result corresponds to a ratio of the neutral current vector and axial vector coupling constants of the tau lepton g_nu_tau((M_Z) ^2)/gAtau((M_Z)^2) = 0.076 +/- 0.023 and a value of the electroweak mixing parameter sin^2(teta_W((M_Z)^ 2))) = 0.2302 +/- 0.0058.

D., D., B., D., C., G., J., L., M., M., R., A., et al. (1991). Measurement of the polarization of tau leptons produced in Z decays. PHYSICS LETTERS. SECTION B, 265(3-4), 430-444 [10.1016/0370-2693(91)90079-6].

Measurement of the polarization of tau leptons produced in Z decays

BOTTIGLI, UBALDO;CIOCCI, MARIA AGNESE;MARROCCHESI, PIER SIMONE;
1991-01-01

Abstract

The polarization of tau leptons produced in the reaction e+ e- at the Z resonance has been measured using the tau decay modes e nu_e nu_tau, mu nu_mu nu_tau, pi nu_tau, rho nu_tau and a_1 nu_tau. The mean value obtained is P_tau = -0.152 +/- 0.045, indicating that parity is violated in the neutral current process e+e- ->tau+tau-. The result corresponds to a ratio of the neutral current vector and axial vector coupling constants of the tau lepton g_nu_tau((M_Z) ^2)/gAtau((M_Z)^2) = 0.076 +/- 0.023 and a value of the electroweak mixing parameter sin^2(teta_W((M_Z)^ 2))) = 0.2302 +/- 0.0058.
1991
D., D., B., D., C., G., J., L., M., M., R., A., et al. (1991). Measurement of the polarization of tau leptons produced in Z decays. PHYSICS LETTERS. SECTION B, 265(3-4), 430-444 [10.1016/0370-2693(91)90079-6].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11365/35687
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