Search for the rare decay D${}^0$ $\to$ ${\mu }^{+}{\mu }^{-}$ in proton-proton collisions at $\sqrt{s}$ = 13.6 TeV

Abstract

A search for the rare decay D${}^0$ $\to$ ${\mu }^{+}{\mu }^{-}$ is reported using proton-proton collision events at $\sqrt{s}$ = 13.6 TeV collected by the CMS detector in 2022$-$2023, corresponding to an integrated luminosity of 64.5 fb${}^{-1}$. This is the first analysis to use a newly developed inclusive dimuon trigger, expanding the scope of the CMS flavor physics program. The search uses D${}^0$ mesons obtained from D${}^{\ast +}$ $\to$ D${}^0{\pi }^{+}$ decays. No significant excess is observed. A limit on the branching fraction of $\mathcal{B}$(D${}^0$ $\to$ ${\mu }^{+}{\mu }^{-}$) $<$ 2.4 $\times$ 10${}^{-9}$ at 95% confidence level is set. This is the most stringent upper limit set on any flavor changing neutral current decay in the charm sector.

Replaced with the published version. Added the journal reference and the DOI. All the figures and tables, including additional supplementary figures, can be found at http://cms-results.web.cern.ch/cms-results/public-results/publications/BPH-23-008 (CMS Public Pages)

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• Measurement of D${}^0$ meson photoproduction in ultraperipheral heavy ion collisions