Precise measurement of Br(tau^- -> K^*0(892) K^- nu_tau) and the mass and width of the K^*0(892) meson

Details Precise measurement of Br(tau^- -> K^*0(892) K^- nu_tau) and the mass and width of the K^*0(892) meson Precise measurement of Br(tau^- -> K^*0(892) K^- nu_tau) and the mass and width of the K^*0(892) meson

2008-08-07

arxiv.org/abs/0808.1059v1

Physics

High Energy Physics

High Energy Physics - Experiment

9 pages, 4 figures, Contributed to the 34th International Conference on High Energy Physics, Philadelphia, USA, July 2008

Scientific paper

Using the high statistics tau data sample recorded in the Belle experiment at KEKB, we have greatly improved the precision of the branching fraction Br(tau^- -> K^*0(892) K^- nu_tau) = (1.56+-0.02+-0.09)x10^-3, while the mass and width of the K^*0(892) meson are measured to be (895.10+-0.27+-0.31) MeV/c^2 and (47.23+-0.49+-0.79) MeV/c^2, respectively, with better accuracy than the PDG world average values. The first measurement of the decay tau^- -> K^*0(892) K^- pi^0 nu_tau is also reported with a branching fraction of Br(tau^- -> K^*0(892) K^- pi^0 nu_tau)=(2.39+-0.46+-0.26)x10^-5.

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