The polarisation of tau's produced in Z decay is measured using 160 pb(-1) of data accumulated at LEP by the ALEPH detector between 1990 and 1995. The variation of the polarisation with polar angle yields the two parameters A(e) = 0.1504 +/- 0.0068 and A(tau) = 0.1451 +/- 0.0059 which are consistent with the hypothesis of e-tau universality. Assuming universality, the value A(e-tau) = 0.1474 +/- 0.0045 is obtained from which the effective weak mixing angle sin(2) theta (eff)(W) = 0.23147 +/- 0.00057 is derived.

Measurement of the Tau Polarisation at LEP / Heister, A., Schael, S., Barate, R., De Bonis, I., Decamp, D., Ghez, P., Goy, C., Lees, J.p., Merle, E., Minard, N.n., Pietrzyk, B., Alemany, R., Bravo, S., Casado, M.p., Chmeissani, M., Crespo, J.m., Fernandez, E., Fernandez Bosman, M., Garrido, L., Grauges, E., et al.. - In: THE EUROPEAN PHYSICAL JOURNAL. C, PARTICLES AND FIELDS. - ISSN 1434-6044. - STAMPA. - 20:3(2001), pp. 401-430. [10.1007/s100520100689]

Measurement of the Tau Polarisation at LEP

CREANZA, Donato Maria;IASELLI, Giuseppe;MAGGI, Giorgio Pietro;
2001

Abstract

The polarisation of tau's produced in Z decay is measured using 160 pb(-1) of data accumulated at LEP by the ALEPH detector between 1990 and 1995. The variation of the polarisation with polar angle yields the two parameters A(e) = 0.1504 +/- 0.0068 and A(tau) = 0.1451 +/- 0.0059 which are consistent with the hypothesis of e-tau universality. Assuming universality, the value A(e-tau) = 0.1474 +/- 0.0045 is obtained from which the effective weak mixing angle sin(2) theta (eff)(W) = 0.23147 +/- 0.00057 is derived.
2001
Measurement of the Tau Polarisation at LEP / Heister, A., Schael, S., Barate, R., De Bonis, I., Decamp, D., Ghez, P., Goy, C., Lees, J.p., Merle, E., Minard, N.n., Pietrzyk, B., Alemany, R., Bravo, S., Casado, M.p., Chmeissani, M., Crespo, J.m., Fernandez, E., Fernandez Bosman, M., Garrido, L., Grauges, E., et al.. - In: THE EUROPEAN PHYSICAL JOURNAL. C, PARTICLES AND FIELDS. - ISSN 1434-6044. - STAMPA. - 20:3(2001), pp. 401-430. [10.1007/s100520100689]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11589/3602
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