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Study of tau- -> K_S pi- nu_tau decay at Belle

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arxiv 0706.2231 v1 pith:KOZYYNQY submitted 2007-06-15 hep-ex

Belle Collaboration This is my paper · ORCID
classification hep-ex
keywords decaymassstatsysttau-analysisaveragebelle
verification ladder T0 review T1 audit T2 compute T3 formal

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We present a study of the decay tau- -> K_S pi- nu_tau using a 351 fb^-1 data sample collected with the Belle detector. The analysis is based on 53110 lepton-tagged signal events. The measured branching fraction B(tau- -> K_S pi- nu_tau)=(0.404 +- 0.002(stat.) +- 0.013(syst.))% is consistent with the world average value and has better accuracy. An analysis of the K_S pi- invariant mass spectrum reveals contributions from the K*(892)- as well as other states. For the first time the K*(892)- mass and width have been measured in tau decay: M(K*(892)-)=(895.47 +- 0.20(stat.) +- 0.44(syst.) +- 0.59(mod.)) MeV/c2, Gamma(K*(892)-)=(46.2 +- 0.6(stat.) +- 1.0(syst.) +- 0.7(mod.)) MeV. The K*(892)- mass is significantly different from the current world average value.

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Forward citations

Cited by 5 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. Light-Cone Sum Rules for $B\to K\pi$ Form Factors and Applications to Rare Decays

    hep-ph 2019-08 accept novelty 7.0 of 10

    P-wave B→Kπ form factors are derived from light-cone sum rules with B-meson distribution amplitudes, and the K* width is shown to produce a universal ~10% form-factor increase, corresponding to a ~20% rate enhancement.

  2. Forward backward CP asymmetry in $\tau^- \to K \pi \nu_{\tau}$ in the Left-Right Inverse seesaw model

    hep-ph 2026-04 unverdicted novelty 6.0 of 10

    The Left-Right Inverse Seesaw model generates a non-decoupling scalar operator that enhances the differential forward-backward CP asymmetry A_CP^FB(s) near K* and K0* resonances in τ → Kπν_τ while leaving the integrat...

  3. Unified study of two-meson and axion-meson production from semileptonic tau decays within resonance chiral framework

    hep-ph 2025-07 conditional novelty 6.0 of 10

    Within a resonance chiral model, hadron resonances boost predicted tau decays into pion/K plus axion by factors of 7.5 and 19.2, with branching ratios and forward-backward asymmetries also predicted.

  4. CP violation studies at Super Tau-Charm Facility

    hep-ex 2025-02 conditional novelty 4.0 of 10

    A future Super Tau-Charm Facility is projected to test CP violation in hyperon, tau, and charm decays at 1e-4 to 1e-3 sensitivities and improve the kaon CPT mass-difference limit tenfold.

  5. Hadronic tau decays

    hep-ph 2025-04 unverdicted

    This review derives and explains the Standard Model machinery of hadronic tau decays, from decay distributions to inclusive QCD tests and beyond-Standard-Model analyses.

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