Search for $B_{(s)}^{\ast 0}\to {\mu }^{+}{\mu }^{-}$ in $B_c^{+}\to {\pi }^{+}{\mu }^{+}{\mu }^{-}$ decays

Abstract

A search for the very rare $B^{\ast 0}\to {\mu }^{+}{\mu }^{-}$ and $B_s^{\ast 0}\to {\mu }^{+}{\mu }^{-}$ decays is conducted by analysing the $B_c^{+}\to {\pi }^{+}{\mu }^{+}{\mu }^{-}$ process. The analysis uses proton-proton collision data collected with the LHCb detector between 2011 and 2018, corresponding to an integrated luminosity of 9${\text{fb}}^{-1}$. The signal signatures correspond to simultaneous peaks in the ${\mu }^{+}{\mu }^{-}$ and ${\pi }^{+}{\mu }^{+}{\mu }^{-}$ invariant masses. No evidence for an excess of events over background is observed for either signal decay mode. Upper limits at the $90\%$ confidence level are set on the branching fractions relative to that for $B_c^{+}\to J/\psi {\pi }^{+}$ decays, \begin{equation*} {\cal R}_{B^{*0}(μ^+μ^-)π^+/J\mskip -3mu/\mskip -2muψπ^+} < 3.8\times 10^{-5}\ \text{ and }\: {\cal R}_{B_{s}^{*0}(μ^+μ^-)π^+/J\mskip -3mu/\mskip -2muψπ^+} < 5.0\times 10^{-5}\,. \end{equation*}

arXiv commentAll figures and tables, along with machine-readable versions and any supplementary material and additional information, are available at https://lbfence.cern.ch/alcm/public/analysis/full-details/1796/ (LHCb public pages)

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