First Observation of the Decay tau^- -> phi K^- nu_tau
Belle colaboration
TL;DR
This paper reports the first observation of tau lepton decays involving a phi meson, measuring a specific branching fraction using data from the Belle experiment, advancing understanding of tau decay modes.
Contribution
The paper presents the first observation of tau decays to phi K- nu, providing a new measurement of its branching fraction based on Belle data.
Findings
First observation of tau^- -> phi K^- nu_tau decay
Branching fraction measured as (4.05 +- 0.25 +- 0.26) x 10^-5
Supports theoretical models of tau hadronic decays
Abstract
We present the first observation of tau lepton decays to hadronic final states with a phi-meson. This analysis is based on 401 fb^-1 of data accumulated at the Belle experiment. The branching fraction obtained is B(tau- -> phi K- nu) = (4.05 +- 0.25 +- 0.26) x 10^-5.
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