Measurement Of The Hadronic Decay Current In Tau(-)-]Tau(-)Tau(-)Tau(+)Nu(Tau)
ZEITSCHRIFT FUR PHYSIK C-PARTICLES AND FIELDS(1995)
Abstract
The decay tau(-) --> pi(-) pi(-) pi(+) nu(tau), has been studied using data collected with the OPAL detector at LEP during 1992 and 1993. The hadronic structure functions for this decay are measured model independently assuming G-parity invariance and neglecting scalar currents. Simultaneously the parity violating asymmetry parameter is determined to be gamma(V) (A) = 1.08(-0.41)(+0.46) (+0.14)(-0.25), consistent with the Standard Model prediction of gamma(V) (A) = 1 for left-handed tau neutrinos. Models of Kuhn and Santamaria and of Isgur et al. are used to fit distributions of the invariant 3 pi mass as well as 2 pi mass projections of the Dalitz plot. The model dependent mass and width of the a(1) resonance are measured to be m(a1) = 1.266 +/- 0.014(-0.002)(+0.012) GeV and Gamma(a1) = 0.610 +/- 0.049(-0.019)(+0.053) GeV for the Kuhn and Santa-maria model and m(a1) = 1.202 +/- 0.009(-0.001)(+0.009) GeV and Gamma(a1) = 0.422 +/- 0.023(-0.004)(+0.033) GeV for the Isgur et al. model. The model dependent values obtained for the parity violating asymmetry parameter are gamma(V) (A) = 0.87 +/- 0.27(-0.06)(+0.05) for the Kuhn and Santamaria model and gamma(V) (A) = 1.10 +/- 0.31(-0.14)(+0.13) for the Isgur et al. model. Within the Isgur et al, model the ratio of the S- and D-wave amplitudes is measured to be D/S = -0.09 +/- 0.03 +/- 0.01.
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