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A Study of the Lorentz Structure in $\tau$ Decays / DELPHI Collaboration
This paper describes a measurement of the Michel parameters, $\eta$, $\rho$, $\xi$, $\xi \delta$, and the average $\nu_{\tau}$helicity, $h_{\nu_{\tau}}$, in $\tau$ lepton decays together withthe first measurement of the tensor coupling in the weak charged current.The $\tau^{+} \tau^{-}$ pairs were produced at the LEP $\mathrm{e^{+} e^{-}}$collider at CERN from 1992 through 1995 in the DELPHI detector.Assuming lepton universality in the decays of the $\tau$ the measured valuesof the parameters were:$\eta = -0.005 \pm 0.036 \pm 0.037$,$\rho = 0.775 \pm 0.023 \pm 0.020$,$\xi = 0.929 \pm 0.070 \pm 0.030$,$\xi\delta = 0.779 \pm 0.070 \pm 0.028$, $h_{\nu_{\tau}} = -0.997 \pm 0.027 \pm 0.011$.The strength of the tensor coupling was measured to be $\kappa^W_\tau = -0.029\pm 0.036 \pm 0.018$. The first error is statistical and the second erroris systematic in all cases.The results are consistent with the $V\!-\!A$ structure of the weak chargedcurrent in decays of the $\tau$ lepton..
hep-ex/0107076; CERN-EP-2000-027; CERN-EP-2000-027.- Geneva : CERN, 2000 - 38 p. - Published in : Eur. Phys. J. C 16 (2000) 229-252 Fulltext: ep-2000-027 - PDF; arXiv:hep-ex_0107076 - PDF; External link: Preprint
In : 30th International Conference on High-energy Physics, Osaka, Japan, 27 Jul - 2 Aug 2000, pp.e-page 278 - Please contact the library if you need to access this document.

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