Search for the rare decay D$^0$ $\to$ $μ^+μ^-$ in proton-proton collisions at $\sqrt{s}$ = 13.6 TeV
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arXiv
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| Format: | Preprint |
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2025
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| _version_ | 1866915545244237824 |
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| author | CMS Collaboration |
| author_facet | CMS Collaboration |
| contents | 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$^0π^+$ decays. No significant excess is observed. A limit on the branching fraction of $\mathcal{B}$(D$^0$ $\to$ $μ^+μ^-$) $\lt$ 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. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2506_06152 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Search for the rare decay D$^0$ $\to$ $μ^+μ^-$ in proton-proton collisions at $\sqrt{s}$ = 13.6 TeV CMS Collaboration High Energy Physics - Experiment 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$^0π^+$ decays. No significant excess is observed. A limit on the branching fraction of $\mathcal{B}$(D$^0$ $\to$ $μ^+μ^-$) $\lt$ 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. |
| title | Search for the rare decay D$^0$ $\to$ $μ^+μ^-$ in proton-proton collisions at $\sqrt{s}$ = 13.6 TeV |
| topic | High Energy Physics - Experiment |
| url | https://arxiv.org/abs/2506.06152 |