Using the data collected with the L3 detector at LEP between 1990 and 1995, corresponding to an integrated luminosity of 149 pb(-1), the tau longitudinal polarisation has been measured as a function of the production polar angle using the tau decays tau(-) --> h(-)nu(tau) (h = pi,rho,a(1)) and tau(-)-->l(-)<(nu)over bar>(l)nu(tau) (l = e,mu). From this measurement the quantities A(c) and A(tau), which depend on the couplings of the electron and the tau to the Z, are determined to be A(c) = 0.1678 +/- 0.0127 +/- 0.0030 and A(tau) = 0.1476 +/- 0.0088 +/- 0.0062, consistent with the hypothesis of e-tau universality, Under this assumption a value of A(l) = 0.1540 +/- 0.0074 +/- 0.0044 is obtained, yielding the value of the effective weak mixing angle sin(2)<(theta)over bar>(W) = 0.2306 +/- 0.0011. (C) 1998 Elsevier Science B.V. All rights reserved.

Measurement of tau polarisation at LEP / M., A., O., A., M., A.B., S., A., J., A., G., A., J., A., A., A., M. G., A., G., A., H., A., V. P., A., T., A., F., A., A., A., T., A., T., A., Bagnaia, P., L., B., R. C., B., et al.. - In: PHYSICS LETTERS. SECTION B. - ISSN 0370-2693. - 429:(1998), pp. 387-398. [10.1016/S0370-2693(98)00406-7]

Measurement of tau polarisation at LEP

BAGNAIA, Paolo;FACCINI, Riccardo;GENTILE, Simonetta;GIAGU, Stefano;ORGANTINI, Giovanni;
1998

Abstract

Using the data collected with the L3 detector at LEP between 1990 and 1995, corresponding to an integrated luminosity of 149 pb(-1), the tau longitudinal polarisation has been measured as a function of the production polar angle using the tau decays tau(-) --> h(-)nu(tau) (h = pi,rho,a(1)) and tau(-)-->l(-)<(nu)over bar>(l)nu(tau) (l = e,mu). From this measurement the quantities A(c) and A(tau), which depend on the couplings of the electron and the tau to the Z, are determined to be A(c) = 0.1678 +/- 0.0127 +/- 0.0030 and A(tau) = 0.1476 +/- 0.0088 +/- 0.0062, consistent with the hypothesis of e-tau universality, Under this assumption a value of A(l) = 0.1540 +/- 0.0074 +/- 0.0044 is obtained, yielding the value of the effective weak mixing angle sin(2)<(theta)over bar>(W) = 0.2306 +/- 0.0011. (C) 1998 Elsevier Science B.V. All rights reserved.
1998
01 Pubblicazione su rivista::01a Articolo in rivista
Measurement of tau polarisation at LEP / M., A., O., A., M., A.B., S., A., J., A., G., A., J., A., A., A., M. G., A., G., A., H., A., V. P., A., T., A., F., A., A., A., T., A., T., A., Bagnaia, P., L., B., R. C., B., et al.. - In: PHYSICS LETTERS. SECTION B. - ISSN 0370-2693. - 429:(1998), pp. 387-398. [10.1016/S0370-2693(98)00406-7]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/472581
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