$B\to K{+}$invisible, dark matter, and $CP$ violation in hyperon decays
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| Format: | Preprint |
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2025
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| _version_ | 1866918085680693248 |
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| author | He, Xiao-Gang Ma, Xiao-Dong Tandean, Jusak Valencia, German |
| author_facet | He, Xiao-Gang Ma, Xiao-Dong Tandean, Jusak Valencia, German |
| contents | Recently the Belle II Collaboration has reported a measurement of the $B^+\to K^+ν\barν$ rate that is higher than the standard-model expectation. Since the emitted neutrinos are unobserved, the excess could be due to the $B^+$ decaying into a $K^+$ and a dark-matter pair. We entertain this possibility in a two-Higgs-doublet model supplemented with a real singlet scalar boson acting as the dark matter. This model also accommodates strangeness-changing interactions providing new sources of $CP$ violation which can affect hyperon and kaon nonleptonic transitions. We find that the resulting $CP$ violation in the hyperon sector can be significant, reaching the current empirical bounds, after taking into account constraints from kaon mixing and decay and from dark-matter relic-density data and direct searches including the Migdal effect. We demonstrate that the hyperon and kaon processes are complementary probes of this new-physics scenario. Its prediction for sizable hyperon $CP$ violation is potentially testable in ongoing experiments, such as BESIII, Belle II, and LHCb, and in next-generation ones like PANDA and at the Super Tau Charm Facility. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2502_09603 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | $B\to K{+}$invisible, dark matter, and $CP$ violation in hyperon decays He, Xiao-Gang Ma, Xiao-Dong Tandean, Jusak Valencia, German High Energy Physics - Phenomenology High Energy Physics - Experiment Recently the Belle II Collaboration has reported a measurement of the $B^+\to K^+ν\barν$ rate that is higher than the standard-model expectation. Since the emitted neutrinos are unobserved, the excess could be due to the $B^+$ decaying into a $K^+$ and a dark-matter pair. We entertain this possibility in a two-Higgs-doublet model supplemented with a real singlet scalar boson acting as the dark matter. This model also accommodates strangeness-changing interactions providing new sources of $CP$ violation which can affect hyperon and kaon nonleptonic transitions. We find that the resulting $CP$ violation in the hyperon sector can be significant, reaching the current empirical bounds, after taking into account constraints from kaon mixing and decay and from dark-matter relic-density data and direct searches including the Migdal effect. We demonstrate that the hyperon and kaon processes are complementary probes of this new-physics scenario. Its prediction for sizable hyperon $CP$ violation is potentially testable in ongoing experiments, such as BESIII, Belle II, and LHCb, and in next-generation ones like PANDA and at the Super Tau Charm Facility. |
| title | $B\to K{+}$invisible, dark matter, and $CP$ violation in hyperon decays |
| topic | High Energy Physics - Phenomenology High Energy Physics - Experiment |
| url | https://arxiv.org/abs/2502.09603 |