Measurement of the polarization of τ leptons produced in Z decays

D. Decamp, B. Deschizeaux, C. Goy, J. P. Lees, M. N. Minard, R. Alemany, J. M. Crespo, M. Delfino, E. Fernandez, V. Gaitan, Ll Garrido, Ll M. Mir, A. Pacheco, M. G. Catanesi, D. Creanza, M. de Palma, A. Farilla, G. Iaselli, G. Maggi, M. MaggiS. Natali, S. Nuzzo, M. Quattromini, A. Ranieri, G. Raso, F. Romano, F. Ruggieri, G. Selvaggi, L. Silvestris, P. Tempesta, G. Zito, Y. Gao, H. Hu, D. Huang, X. Huang, J. Lin, J. Lou, C. Qiao, T. Ruan, T. Wang, Y. Xie, D. Xu, R. Xu, J. Zhang, W. Zhao, W. B. Atwood, L. A.T. Bauerdick, F. Bird, E. Blucher, G. Bonvicini, F. Bossi, J. Boudreau, D. Brown, T. H. Burnett, H. Drevermann, R. W. Forty, C. Grab, R. Hagelberg, S. Haywood, J. Hilgart, B. Jost, M. Kasemann, J. Knobloch, A. Lacourt, E. Lançon, I. Lehraus, T. Lohse, A. Marchioro, M. Martinez, P. Mato, S. Menary, A. Minten, A. Miotto, R. Miquel, H. G. Moser, J. Nash, P. Palazzi, F. Ranjard, G. Redlinger, A. Roth, J. Rothberg, H. Rotscheidt, M. Saich, R. St.Denis, D. Schlatter, M. Takashima, M. Talby, W. Tejessy, H. Wachsmuth, S. Wasserbaech, S. Wheeler, W. Wiedenmann, W. Witzeling, J. Wotschack, Z. Ajaltouni, M. Bardadin-Otwinowska, R. El Fellous, A. Falvard, P. Gay, J. Harvey

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The polarization of τ leptons produced in the reaction e+e-→τ+τ- at the Z resonance has been measured using the τ decay modes eνeντ, μνμντ, πντ, ρ{variant}ντ, and a1ντ. The mean value obtained is Pτ = -0.152±0.045, indicating that parity is violated in the neutral current process e+e- → τ+τ-. The result corresponds to a ratio of a neutral current vector and axial vector coupling constants of the τ lepton gVτ (M2Z) gAτ(M2Z) = 0.076±0.023 and a value of the electroweak mixing parameter sin2θw(M2Z) = 0.2302 ± 0.0058. © 1991.
Original languageEnglish
Pages (from-to)430-444
JournalPhysics Letters B
Issue number3-4
Publication statusPublished - 15 Aug 1991


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