Compact Muon Solenoid
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| CMS-PAS-BPH-23-008 | ||
| Search for rare charm decays into two muons | ||
| CMS Collaboration | ||
| 28 July 2024 | ||
| Abstract: A search for the rare decay $ {\mathrm D}^0\to\mu^{+}\mu^{-} $ was conducted using $ \sqrt{s} = $ 13.6 TeV proton-proton collision data collected by the CMS experiment during the 2022-2023 operation of the CERN LHC, with an integrated luminosity of 64.5 fb$^{-1}$. The search exploits a new high-rate trigger that records events with two muons with transverse momenta as low as 4 and 3 GeV. Rare decays of the charm quark, which are less explored than rare bottom quark decays, offer a unique way to probe for new physics effects beyond the reach of modern colliders. No significant excess above the expected background was observed, leading to an upper limit of $ \mathcal{B}({\mathrm D}^0\to\mu^{+}\mu^{-}) < $ 2.6 $\times$ 10$^{-9} $ at the 95% confidence level. This is the most sensitive measurement to date, imposing additional constraints on new physics models. | ||
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Links:
CDS record (PDF) ;
CADI line (restricted) ;
These preliminary results are superseded in this paper, Submitted to PRL. The superseded preliminary plots can be found here. |
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Compact Muon Solenoid LHC, CERN |
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