Measurement of tau polarization in e+ e- annihilation at sqrt{s}=58 GeV
arXiv:hep-ex/9703003 · doi:10.1016/S0370-2693(97)00506-6
Abstract
The polarization of tau leptons in the reaction e+ e- --> tau+ tau- has been measured using a e+e- collider, TRISTAN, at the center-of-mass energy of 58 GeV. From the kinematical distributions of daughter particles in tau --> e nu nu-bar, mu nu nu-bar, rho nu or pi(K) nu decays, the average polarization of tau- and its forward-backward asymmetry have been evaluated to be 0.012 +- 0.058 and 0.029 +- 0.057, respectively.
18 pages, 5 figures