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Volume 377 - 18th International Conference on B-Physics at Frontier Machines (Beauty2019) - Posters
Search for second-class currents with the $\tau$ decay into $\pi\eta\nu$
K. Ogawa,* M. Hernández Villanueva, K. Hayasaka
*corresponding author
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Pre-published on: 2020 February 21
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The hadronic weak currents without strangeness can be classified into first- and second-class currents according to their $G$-transformation properties. In the Standard Model, second-class currents are strongly suppressed by isospin symmetry violation and no such currents have been observed so far. Given its quantum numbers, the decay $\tau^- \to \pi^- \eta\nu_{\tau}$ can be induced only through second-class currents, with theoretical predictions estimating a branching ratio of $\mathrm{O}(10^{-5})$. Such a fraction is reachable within the available integrated luminosity at the Belle experiment. In this work, we report the status of the analysis of the decay channel $\tau^- \to \pi^- \eta\nu_{\tau}$ based on Monte Carlo simulated samples. Expected sensitivities assuming the full data size of the Belle experiment are also presented.
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