Search for $B^0\to {\pi }^{-}{\tau }^{+}{\nu }_{\tau }$ with hadronic tagging at Belle

Abstract

We search for the process $B^0\to {\pi }^{-}{\tau }^{+}{\nu }_{\tau }$ using the full Belle data set of $711{\mathrm{fb}}^{-1}$, corresponding to $772\times 10^{6}B\bar{B}$ pairs, collected at the ${\rm Y}(4S)$ resonance with the Belle detector at the KEKB asymmetric-energy $e^{+}{e}^{-}$ collider. We reconstruct one $B$ meson in a hadronic decay and search for the $B^0\to {\pi }^{-}{\tau }^{+}{\nu }_{\tau }$ process in the remainder of the event. No significant signal is observed and an upper limit of $\mathcal{B}(B^0\to {\pi }^{-}{\tau }^{+}{\nu }_{\tau })<2.5\times 10^{-4}$ is obtained at the $90\%$ confidence level.

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• Semitauonic $b$-hadron decays: A lepton flavor universality laboratory
• Challenges in Semileptonic B Decays
• Correlating Tauonic B Decays to the Neutron EDM via a Scalar Leptoquark
• Model independent analysis of $b\to (c,u)\tau \nu$ leptonic and semileptonic decays
• Probing New Physics with $\bar{B}\to \rho (770){\ell }^{-}{\bar{\nu }}_{\ell }$ and $\bar{B}\to a_1(1260){\ell }^{-}{\bar{\nu }}_{\ell }$
• $B\to \rho l\bar{\nu }$ and $\omega l\bar{\nu }$ in and beyond the Standard Model: Improved predictions and $|V_{ub}|$
• Mapping out the Space for New Physics with Leptonic and Semileptonic $B_{(c)}$ Decays
• Impact of vector new physics couplings on $B_s\to (K,K^{\ast })\tau \nu$ and $B\to \pi \tau \nu$ decays
• New physics contributions in $B\to \pi \tau \bar{\nu }$ and $B\to \tau \bar{\nu }$
• The $B\to \pi \ell {\nu }_{\ell }$ semileptonic decay within the LCSR approach under heavy quark effective field theory
• Investigating the effect of $U_1$ vector leptoquark on $b\to u\tau \bar{\nu }$ mediated $B$ decays
• Impact of $b\to c$ measurements on ${\Lambda }_b\to p\tau \bar{\nu }$ decay in $U_1$ leptoquark model