A search for rare $B\to D{\mu }^{+}{\mu }^{-}$ decays

Abstract

A search for rare $B\to D{\mu }^{+}{\mu }^{-}$ decays is performed using proton-proton collision data collected by the LHCb experiment, corresponding to an integrated luminosity of 9 fb${}^{-1}$. No significant signals are observed in the non-resonant ${\mu }^{+}{\mu }^{-}$ modes, and upper limits of $\mathcal{B}(B^0\to {\overline{D}}^0{\mu }^{+}{\mu }^{-})<5.1\times 10^{-8}$, $\mathcal{B}(B^{+}\to D_s^{+}{\mu }^{+}{\mu }^{-})<3.2\times 10^{-8}$, $\mathcal{B}(B_s^0\to {\overline{D}}^0{\mu }^{+}{\mu }^{-})<1.6\times 10^{-7}$ and $f_c/f_u\cdot \mathcal{B}(B_c^{+}\to D_s^{+}{\mu }^{+}{\mu }^{-})<9.6\times 10^{-8}$ are set at the 95\% confidence level, where $f_c$ and $f_u$ are the fragmentation fractions of a $B$ meson with a $c$ and $u$ quark respectively in proton-proton collisions. Each result is either the first such measurement or an improvement by three orders of magnitude on an existing limit. Separate upper limits are calculated when the muon pair originates from a $J/\psi \to {\mu }^{+}{\mu }^{-}$ decay. The branching fraction of $B_c^{+}\to D_s^{+}J/\psi$ multiplied by the fragmentation-fraction ratio is measured to be $f_c/f_u\cdot \mathcal{B}(B_c^{+}\to D_s^{+}J/\psi )=(1.63\pm 0.15\pm 0.13)\times 10^{-5}$, where the first uncertainty is statistical and the second systematic.

arXiv commentAll figures and tables, along with any supplementary material and additional information, are available at https://cern.ch/lhcbproject/Publications/p/LHCb-PAPER-2022-048.html (LHCb public pages)

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• Search for $B_c^{+}\to {\pi }^{+}{\mu }^{+}{\mu }^{-}$ decays and measurement of the branching fraction ratio $\mathcal{B}(B_c^{+}\to \psi (2S){\pi }^{+})/\mathcal{B}(B_c^{+}\to J/\psi {\pi }^{+})$