Search for the Rare Decay 𝐷 0 → 𝜇 + 𝜇 − in Proton-Proton Collisions at $\sqrt{s}$ = 13.6 TeV
A search for the rare decay 𝐷 0 → 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* + → 𝐷 0 𝜋 + decays. No significant excess is observed. A limit on the branching fraction of ℬ(𝐷 0 → 𝜇 + 𝜇 − ) < 2.4 × 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.
Charmed mesons↗