Is Dark Matter the origin of the $B\to K ν\barν$ excess at Belle II?
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arXiv
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| Autori principali: | , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2025
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| _version_ | 1866911203277668352 |
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| author | Calibbi, Lorenzo Li, Tong Mukherjee, Lopamudra Schmidt, Michael A. |
| author_facet | Calibbi, Lorenzo Li, Tong Mukherjee, Lopamudra Schmidt, Michael A. |
| contents | We present two models of dark matter (DM) that can provide a natural explanation of the excess of $B^+\to K^+ +\,\text{invisible}$ events with respect to the Standard Model (SM) prediction for $B^+\to K^+ ν\barν$, which has been reported by the Belle II collaboration. Interactions between the dark and the visible sector are mediated by an axion-like particle (ALP) in one case, by the kinetic mixing between a dark photon and the SM photon in the second case. Both models encompass a light fermion singlet as the DM candidate and can account for the observed DM relic abundance through, respectively, the freeze-in and the freeze-out production mechanism, while simultaneously explaining the Belle II excess. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2502_04900 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Is Dark Matter the origin of the $B\to K ν\barν$ excess at Belle II? Calibbi, Lorenzo Li, Tong Mukherjee, Lopamudra Schmidt, Michael A. High Energy Physics - Phenomenology High Energy Physics - Experiment We present two models of dark matter (DM) that can provide a natural explanation of the excess of $B^+\to K^+ +\,\text{invisible}$ events with respect to the Standard Model (SM) prediction for $B^+\to K^+ ν\barν$, which has been reported by the Belle II collaboration. Interactions between the dark and the visible sector are mediated by an axion-like particle (ALP) in one case, by the kinetic mixing between a dark photon and the SM photon in the second case. Both models encompass a light fermion singlet as the DM candidate and can account for the observed DM relic abundance through, respectively, the freeze-in and the freeze-out production mechanism, while simultaneously explaining the Belle II excess. |
| title | Is Dark Matter the origin of the $B\to K ν\barν$ excess at Belle II? |
| topic | High Energy Physics - Phenomenology High Energy Physics - Experiment |
| url | https://arxiv.org/abs/2502.04900 |