Study of τ−→KSπ−ντ decay at Belle

2007/06/15 by Belle Collaboration, D. Epifanov, I. Adachi +95 · 3 citations
Physics and Astronomy · #Neutrino Physics Research #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #hep-ex

paper · pdf · doi:10.1016/j.physletb.2007.08.045

published as Phys.Lett.B654:65-73,2007 · 19 pages, 8 figures, submitted to Phys. Lett. B

arxiv created 2007/06/15 · openalex publication_date 2007/08/30 · arxiv updated 2012/08/27 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/01

Abstract

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.

Citations

• The K* 0(800) scalar resonance from Roy–Steiner representations of πK scattering
• Electron identification in Belle
• Review of Particle Physics

Cited by

• What can be learned from the Belle spectrum for the decay τ−→ντKSπ−
• αs(MZ2)from hadronicτdecays
• The determination of α S from τ decays revisited