Search for the lepton-flavour-violating decays $B_s^0\to {\tau }^{\pm }{\mu }^{\mp }$ and $B^0\to {\tau }^{\pm }{\mu }^{\mp }$

Abstract

A search for $B_s^0\to {\tau }^{\pm }{\mu }^{\mp }$ and $B^0\to {\tau }^{\pm }{\mu }^{\mp }$ decays is performed using data corresponding to an integrated luminosity of 3 fb${}^{-1}$ of proton-proton collisions, recorded with the LHCb detector in 2011 and 2012. For this search, the $\tau$ lepton is reconstructed in the ${\tau }^{-}\to {\pi }^{-}{\pi }^{+}{\pi }^{-}{\nu }_{\tau }$ channel. No significant signal is observed. Assuming no contribution from $B^0\to {\tau }^{\pm }{\mu }^{\mp }$ decays, an upper limit is set on the $B_s^0\to {\tau }^{\pm }{\mu }^{\mp }$ branching fraction of $\mathcal{B}\left(B_s^0\to {\tau }^{\pm }{\mu }^{\mp }\right)<4.2\times 10^{-5}$ at $95\%$ confidence level. If instead no contribution from $B_s^0\to {\tau }^{\pm }{\mu }^{\mp }$ decays is assumed, a limit of $\mathcal{B}\left(B^0\to {\tau }^{\pm }{\mu }^{\mp }\right)<1.4\times 10^{-5}$ is obtained at $95\%$ confidence level. These are the first limit on $\mathcal{B}\left(B_s^0\to {\tau }^{\pm }{\mu }^{\mp }\right)$ and the world's best limit on $\mathcal{B}\left(B^0\to {\tau }^{\pm }{\mu }^{\mp }\right)$.

arXiv comment15 pages, 5 figures. All figures and tables, along with any supplementary material and additional information, are available at https://cern.ch/lhcbproject/Publications/p/LHCb-PAPER-2019-016.html

References in corpus (24)

• PYTHIA 6.4 Physics and Manual
• PYTHIA 6.2 Physics and Manual
• A Brief Introduction to PYTHIA 8.1
• Asymptotic formulae for likelihood-based tests of new physics
• Averages of $b$-hadron, $c$-hadron, and $\tau$-lepton properties as of summer 2016
• LHCb Detector Performance
• PHOTOS Monte Carlo: a precision tool for QED corrections in Z and W decays
• Test of lepton universality with $B^0\to K^{\ast 0}{\ell }^{+}{\ell }^{-}$ decays
• The LHCb Trigger and its Performance in 2011
• Decay Chain Fitting with a Kalman Filter
• Search for lepton-universality violation in $B^{+}\to K^{+}{\ell }^{+}{\ell }^{-}$ decays
• Branching ratios and spectral functions of tau decays: final ALEPH measurements and physics implications
• Efficient, reliable and fast high-level triggering using a bonsai boosted decision tree
• Lepton Flavor Violation in B Decays?
• Measurement of the track reconstruction efficiency at LHCb
• Lepton-flavour violating $B$ decays in generic $Z^{\prime }$ models
• Mass distributions marginalized over per-event errors
• Measurement of the fragmentation fraction ratio $f_s/f_d$ and its dependence on $B$ meson kinematics
• Lepton Flavor Violation in Exclusive $b\to s$ Decays
• Revisiting the vector leptoquark explanation of the B-physics anomalies
• Low-energy signatures of the ${\mathrm{PS}}^3$ model: from $B$-physics anomalies to LFV
• Resonance Chiral Lagrangian Currents and Experimental Data for ${\tau }^{-}\to {\pi }^{-}{\pi }^{-}{\pi }^{+}{\nu }_{\tau }$
• Searches for the decays B0 -> l+ tau- and B+ -> l+ nu (l=e,mu) using hadronic tag reconstruction
• Vector leptoquark mass limits and branching ratios of $K_L^0,B^0,B_s\to l_i^{+}{l}_j^{-}$ decays with account of fermion mixing in leptoquark currents

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