Search for the $B_s^0\to {\mu }^{+}{\mu }^{-}\gamma$ decay

Abstract

A search for the fully reconstructed $B_s^0\to {\mu }^{+}{\mu }^{-}\gamma$ decay is performed at the LHCb experiment using proton-proton collisions at $\sqrt{s}=13$\,TeV corresponding to an integrated luminosity of $5.4\mathrm{f}{\mathrm{b}}^{-1}$. No significant signal is found and upper limits on the branching fraction in intervals of the dimuon mass are set \begin{align} {\cal B}(B_s^0 \rightarrow μ^+μ^-γ) < 4.2\times10^{-8},~&m(μμ)\in[2m_μ,~1.70]\,\mathrm{GeV/c^2} ,\nonumber {\cal B}(B_s^0 \rightarrow μ^+μ^-γ) < 7.7\times10^{-8},~&m(μμ)\in[1.70,~2.88]\,\mathrm{GeV/c^2},\nonumber {\cal B}(B_s^0 \rightarrow μ^+μ^-γ) < 4.2\times10^{-8},~&m(μμ)\in[3.92 ,~m_{B_s^0}]\,\mathrm{GeV/c^2},\nonumber \end{align} at 95\% confidence level. Additionally, upper limits are set on the branching fraction in the $[2m_{\mu },1.70]GeV/{\mathrm{c}}^2$ dimuon mass region excluding the contribution from the intermediate $\varphi (1020)$ meson, and in the region combining all dimuon-mass intervals.

arXiv commentAll figures and tables, along with any supplementary material and additional information, are available at https://cern.ch/lhcbproject/Publications/p/LHCb-PAPER-2023-045.html

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