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.

A Measurement of Pi-polarization At Lep / Acciarri, M., Adams, A., Adriani, O., Aguilarbenitez, M., Ahlen, S., Alcaraz, J., Aloisio, A., Alverson, G., Alviggi, M., Ambrosi, G., An, Q., Anderhub, H., Anderson, A.L., Andreev, V.P., Angelescu, T., Antonov, L., Antreasyan, D., Alkhazov, G., Arce, P., Arefiev, A., et al.. - In: PHYSICS LETTERS. SECTION B. - ISSN 0370-2693. - STAMPA. - 341:(1994), pp. 245-256. [10.1016/0370-2693(94)90316-6]

A Measurement of Pi-polarization At Lep

ALOISIO, ALBERTO;ALVIGGI, MARIAGRAZIA;CHIEFARI, GIOVANNI;L. LISTA;MEROLA, LEONARDO;NAPOLITANO, MARCO;PATRICELLI, SERGIO;SCIACCA, CRISOSTOMO;
1994

Abstract

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.
1994
A Measurement of Pi-polarization At Lep / Acciarri, M., Adams, A., Adriani, O., Aguilarbenitez, M., Ahlen, S., Alcaraz, J., Aloisio, A., Alverson, G., Alviggi, M., Ambrosi, G., An, Q., Anderhub, H., Anderson, A.L., Andreev, V.P., Angelescu, T., Antonov, L., Antreasyan, D., Alkhazov, G., Arce, P., Arefiev, A., et al.. - In: PHYSICS LETTERS. SECTION B. - ISSN 0370-2693. - STAMPA. - 341:(1994), pp. 245-256. [10.1016/0370-2693(94)90316-6]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11588/481270
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