Analysis of neutral $B$-meson decays into two muons

Abstract

Branching fraction and effective lifetime measurements of the rare decay $B_s^0\to {\mu }^{+}{\mu }^{-}$ and searches for the decays $B^0\to {\mu }^{+}{\mu }^{-}$ and $B_s^0\to {\mu }^{+}{\mu }^{-}\gamma$ are reported using proton-proton collision data collected with the LHCb detector at centre-of-mass energies of $7$ TeV, $8$ TeV and $13$ TeV, corresponding to a luminosity of $9$ fb${}^{-1}$. The branching fraction $\mathcal{B}(B_s^0\to {\mu }^{+}{\mu }^{-})=\left(3.09_{-0.43-0.11}^{+0.46+0.15}\right)\times 10^{-9}$ and the effective lifetime $\tau (B_s^0\to {\mu }^{+}{\mu }^{-})=(2.07\pm 0.29\pm 0.03)$ are measured, where the first uncertainty is statistical and the second systematic. No significant signal for $B^0\to {\mu }^{+}{\mu }^{-}$ and $B_s^0\to {\mu }^{+}{\mu }^{-}\gamma$ decays is found and upper limits $\mathcal{B}(B^0\to {\mu }^{+}{\mu }^{-})<2.6\times 10^{-10}$ and $\mathcal{B}(B_s^0\to {\mu }^{+}{\mu }^{-}\gamma )<2.0\times 10^{-9}$ at the 95% CL are determined, where the latter is limited to the range $m_{\mu \mu }>4.9$ GeV$/c^2$. The results are in agreement with the Standard Model expectations.

All figures and tables, along with machine-readable versions and any supplementary material and additional information, are available at https://cern.ch/lhcbproject/Publications/p/LHCb-PAPER-2021-007.html (LHCb public pages)

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