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    A measurement of τ polarization at LEP (English)

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    In: Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics ; 341 , 2 ; 245-256  ; 1994
    • ISSN:
      0370-2693
    • Article (Journal)  /  Electronic Resource

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    Abstract With a data sample of 86 000 Z → τ+τ−(γ) events collected in 1990 through 1993 we have measured the polarization of τ-leptons as a function of the production polar angle using the following 1-prong τ decay modes: τ−→ e − v e v τ , τ−→π− (K−)v τ , τ−→ϱ−v τ and τ−→a 1 −v τ . We obtain for the ratio vector to axial-vector weak neutral couplings for electrons g Ve/g Ae=0.0791±0.0099(stat)±0.0025 (syst) and taus g Vτ/g Aτ=0.0752±0.0063 (stat)±0.0045 (syst) consistent with the hypothesis of e - τ universality. Assuming universality of the e - τ neutral current we determine the effective electroweak mixing angle to be sin2 θeff w = 0.2309 ± 0.0016.

    Table of contents – Volume 341, Issue 2

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    123
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    128
    Theoretical studies of the three-body recombination of the muonic helium ion (Heμ−)+ in gaseous helium
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    133
    New q-minkowski space-time and q-Maxwell equations hierarchy from q-conformal invariance
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    139
    Distances on a lattice from non-commutative geometry
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    147
    New phenomenon of nonlinear Regge trajectory and quantum dual string theory
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    153
    Gauged Wess-Zumino terms and equivariant cohomology
    Figueroa-O'Farrill, JoséM. / Stanciu, Sonia et al. | 1994
    160
    Extreme domain wall-black hole complementarity in N=1 supergravity with a general dilaton coupling
    Cvetič, Mirjam et al. | 1994
    166
    Neutrino mass effects in a minimally extended supersymmetric standard model
    Allahverdi, Rouzbeh / Campbell, Bruce A. / Olive, Keith A. et al. | 1994
    173
    Neutrino masses and b-tau unification in the supersymmetric standard model
    Vissani, F. / Smirnov, A. Y. et al. | 1994
    173
    Neutrino masses and b−τ unification in the supersymmetric standard model
    Vissani, Francesco / Smirnov, Alexei Yu. et al. | 1994
    181
    The Chern-Simons coefficient in the Higgs phase
    Kao, Hsien-Chung / Lee, Kimyeong / Lee, Choonkyu / Lee, Taejin et al. | 1994
    187
    Gribov noise on the lattice axial current renormalisation constant
    Paciello, Maria Luigia / Petrarca, Silvano / Taglienti, Bruno / Vladikas, Anastassios et al. | 1994
    195
    QCD1+1 with massless quarks and gauge covariant Sugawara construction
    Langmann, Edwin / Semenoff, Gordon W. et al. | 1994
    205
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    Fleischer, Robert et al. | 1994
    213
    The nucleon axial isoscalar coupling in quantum chromodynamics sum rules
    Jueping Liu / Ze Jian / Yaping Jin / Dunhuan Liu et al. | 1994
    221
    The hadronic vacuum polarization contribution to the muon g−2 in the quark-resonance model
    Pallante, E. et al. | 1994
    228
    Scanning the BFKL pomeron in elastic production of vector mesons at HERA
    Nemchik, J. / Nikolaev, N.N. / Zakharov, B.G. et al. | 1994
    238
    k 0 (K̄0) production in two-photon processes at TRISTAN
    Enomoto, R. / Abe, K. / Abe, T. / Adachi, I. / Adachi, K. / Aoki, M. / Awa, S. / Emi, K. / Fujii, H. / Fujii, K. et al. | 1994
    245
    A measurement of τ polarization at LEP
    Acciarri, M. / Adam, A. / Adriani, O. / Aguilar-Benitez, M. / Ahlen, S. / Alcaraz, J. / Aloisio, A. / Alverson, G. / Alviggi, M.G. / Ambrosi, G. et al. | 1994
    245
    A measurement of tau polarization at LEP
    | 1994

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