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arXiv · 1602.06143

Impact of leptonic $τ$ decays on the distribution of $B \to P μ\barν$ decays

Marzia Bordone·Gino Isidori·Danny van Dyk
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Abstract

We calculate the fully-differential rate of the decays $B\to Pτ(\to μ\barνν)\barν$ where $P = D,π$, which is a background to the semimuonic decays $B\to Pμ\barν$. The decays with a $3ν$ final state can have a sizeable impact on the experimental analyses of the ratios $R_D$ and $R_π$, depending on the event selection in the analysis. We outline a strategy which permits the extraction of $R_P \mathcal{B}(τ\to μ\barνν)$ from the neutrino-inclusive rate. Our analytic results can also be used to test both existing and upcoming experimental analyses. We further provide Monte Carlo samples of the 5D rate of the neutrino-inclusive decays $B\to PμX_{\barν}$.

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Marzia Bordone, Gino Isidori, Danny van Dyk. 2016-07-11. Impact of leptonic $τ$ decays on the distribution of $B \to P μ\barν$ decays. https://doi.org/10.1140/epjc%2Fs10052-016-4202-x

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