Search for rare decays of $D^0$ mesons into two muons

Abstract

A search for the very rare $D^0\to {\mu }^{+}{\mu }^{-}$ decay is performed using data collected by the LHCb experiment in proton-proton collisions at $\sqrt{s}=7$, 8 and $13\mathrm{TeV}$, corresponding to an integrated luminosity of $9\mathrm{f}{\mathrm{b}}^{-1}$. The search is optimised for $D^0$ mesons from $D^{\ast +}\to D^0{\pi }^{+}$ decays but is also sensitive to $D^0$ mesons from other sources. No evidence for an excess of events over the expected background is observed. An upper limit on the branching fraction of this decay is set at $\mathcal{B}(D^0\to {\mu }^{+}{\mu }^{-})<3.1\times 10^{-9}$ at a $90\%$ CL. This represents the world's most stringent limit, constraining models of physics beyond the Standard Model.

All figures and tables, along with any supplementary material and additional information, are available at https://cern.ch/lhcbproject/Publications/p/LHCb-PAPER-2022-029.html (LHCb public pages)

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• Flavor violating Higgs and $Z$ decays at FCC-ee
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• Search for the rare decay D${}^0$ $\to$ ${\mu }^{+}{\mu }^{-}$ in proton-proton collisions at $\sqrt{s}$ = 13.6 TeV
• Explaining the $B_{d(s)}\to K^{(\ast )}{\bar{K}}^{(\ast )}$ puzzle via chiral-flip in $R$-parity violating MSSM with seesaw mechanism