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Search for the Rare Decay

D^{0} \to μ^{+} μ^{-}

in Proton-Proton Collisions at

\sqrt{s} = 13.6 TeV

https://doi.org/10.1103/zc76-rgcp

Chekhovsky, V; Hayrapetyan, A; Makarenko, V; Tumasyan, A; Adam, W; Andrejkovic, J W; Benato, L; Bergauer, T; Chatterjee, S; Damanakis, K; et al (October 2025, Physical Review Letters)

A search for the rare decay

D^{0} \to μ^{+} μ^{-}

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^{* +} \to D^{0} π^{+}

decays. No significant excess is observed. A limit on the branching fraction of

B (D^{0} \to μ^{+} μ^{-}) < 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.

Free, publicly-accessible full text available October 1, 2026

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