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^{*+} \to D^0\pi^+ decays. No significant excess is observed. A limit on the branching fraction of \mathcal{B}(D^0 \to \mu^+\mu^-) \lt 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.
Search for the Rare Decay D0→μ+μ− in Proton-Proton Collisions at sqrt(s)=13.6 TeV
Abbrescia, M.;Colaleo, A.;D'Anzi, B.;Elmetenawee, W.;Louka, M.;Mastrapasqua, V.;My, S.;Nuzzo, S.;Pellecchia, A.;Pompili, A.;Radogna, R.;Simone, F. M.;Stamerra, A.;Troiano, D.;Venditti, R.;Zaza, A.;Tenchini, F.;
2025-01-01
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^{*+} \to D^0\pi^+ decays. No significant excess is observed. A limit on the branching fraction of \mathcal{B}(D^0 \to \mu^+\mu^-) \lt 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.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
