Measurement of the tau polarisation at the Z resonance

D. Buskulic, D. Decamp, C. Goy, J. P. Lees, M. N. Minard, B. Mours, B. Pietrzyk, R. Alemany, F. Ariztizabal, P. Comas, J. M. Crespo, M. Delfino, E. Fenandez, M. Fernandez-Bosman, V. Gaitan, Ll Garrido, T. Mattison, A. Pacheco, C. Padilla, A. PascualD. Creanza, M. de Palma, A. Farilla, G. Iaselli, G. Maggi, M. Maggi, S. Natali, S. Nuzzo, M. Quattromini, A. Ranieri, G. Raso, F. Romano, F. Ruggieri, G. Selvaggi, L. Silvestris, P. Tempesta, G. Zito, Y. Chai, H. Hu, D. Huang, X. Huang, J. Lin, T. Wang, Y. Xie, D. Xu, R. Xu, J. Zhang, W. Zhao, L. A.T. Bauerdick, E. Blucher, G. Bonvicini, J. Boudreau, D. Casper, H. Drevermann, R. W. Forty, G. Ganis, C. Gay, R. Hagelberg, J. Harvey, S. Haywood, J. Hilgart, R. Jacobsen, B. Jost, J. Knobloch, I. Lehraus, T. Lohse, A. Lusiani, M. Martinez, P. Mato, H. Meinhard, A. Minten, A. Miotto, R. Miquel, H. G. Moser, P. Palazzi, J. A. Perlas, J. F. Pusztaszeri, F. Ranjard, G. Redlinger, L. Rolandi, J. Rothberg, T. Ruan, M. Saich, D. Schlatter, M. Schmelling, F. Sefkow, W. Tejessy, H. Wachsmuth, W. Wiedenmann, T. Wildish, W. Witzeling, J. Wotschack, Z. Ajaltouni, F. Badaud, M. Bardadin-Otwinowska, R. El Fellous, A. Falvard, P. Gay, C. Guicheney, P. Henrard

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Abstract

Using 18.8 pb-1 of data collected in 1990 and 1991, ALEPH has measured the tau polarisation in the decay modes τ→ev {Mathematical expression}, τ→μv {Mathematical expression}, τ→πν, τ→ρν and τ→a1ν, using both the individual tau decay kinematics and the event acollinearity. The measurement of the tau polarisation as a function of the production polar angle yields the two parameters Aτ and Ae, where Al=2 gvlgAl/(gvl )2+(gAl)2] The results Aτ=0.143±0.023 and Ae=0.120±0.026 are consistent with the hypothesis of electron-tau universality. Assuming universality yields a measurement of the effective weak mixing angle sin2θweff=0.2332±0.0022. © 1993 Springer-Verlag.
Original languageEnglish
Pages (from-to)369-386
JournalZeitschrift für Physik C Particles and Fields
Volume59
Issue number3
DOIs
Publication statusPublished - 1 Jan 1993

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