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*}

All 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)

References in corpus (13)

• Performance of the LHCb Vertex Locator
• Exclusive semileptonic and nonleptonic decays of the Bc meson
• Reweighting with Boosted Decision Trees
• Measurement of the B${}_{\mathrm{S}}^0$ $\to$ ${\mu }^{+}{\mu }^{-}$ decay properties and search for the B${}^0$ $\to$ ${\mu }^{+}{\mu }^{-}$ decay in proton-proton collisions at $\sqrt{s}$ = 13 TeV
• Bc Meson Formfactors and Bc-->PV Decays Involving Flavor Dependence of Transverse Quark Momentum
• Measurement of the lifetime of the $B_c^{+}$ meson using the $B_c^{+}\to J/\psi {\pi }^{+}$ decay mode
• Study of Bc -> BP,BV Decays with QCD Factorization
• Study of the rare decays $B_{s,d}^{\ast }\to {\mu }^{+}{\mu }^{-}$
• Study of the rare decays $B_{(}s,d{)}^{\ast }$ arrow $l^{+}{l}^{-}$ in Z' model
• Observation of the $B_c^{+}\to J/\psi {\pi }^{+}{\pi }^0$ decay
• Prospects for studies of $D^{\ast 0}\to {\mu }^{+}{\mu }^{-}$ and $B_{(s)}^{\ast 0}\to {\mu }^{+}{\mu }^{-}$ decays
• Measurement of the ratio of branching fractions $\mathcal{B}(B_c^{+}\to B_s^0{\pi }^{+})/\mathcal{B}(B_c^{+}\to J/\psi {\pi }^{+})$
• Search for $B_c^{+}\to {\pi }^{+}{\mu }^{+}{\mu }^{-}$ decays and measurement of the branching fraction ratio $\mathcal{B}(B_c^{+}\to \psi (2S){\pi }^{+})/\mathcal{B}(B_c^{+}\to J/\psi {\pi }^{+})$