Probing vector- vs scalar-mediator dark-matter scenarios in $B\to (K,K^*) M_X$ decays
Fuente:
arXiv
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| Autori principali: | , , |
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| Natura: | Preprint |
| Pubblicazione: |
2025
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| _version_ | 1866913089790672896 |
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| author | Berezhnoy, Alexander Lucha, Wolfgang Melikhov, Dmitri |
| author_facet | Berezhnoy, Alexander Lucha, Wolfgang Melikhov, Dmitri |
| contents | Within the hypothesis of the dark-matter origin of the excess in $B\to K M_X$ decays over the standard-model expectation, observed by Belle-II, we show that: (i) Scalar- and vector-medator scenarios may be unambiguously discriminated by measuring the differential distributions in $B\to K M_X$ and $B\to K^* M_X$ decays. (ii) Combining the available data on $Γ(B\to K M_X)$ and the upper limit on $Γ(B\to K^* M_X)$ provides a tight constraint on the vector mediator mass $M_V\lesssim 3$ GeV. At the same time, no constraints on the scalar-mediator mass are imposed by these data. (iii) Both scalar- and vector-mediator scenarios allow a good description of the differential distributions in $B\to K M_X$ measured by Belle-II and an extraction of dark-model parameters within both scenarios. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2507_10801 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Probing vector- vs scalar-mediator dark-matter scenarios in $B\to (K,K^*) M_X$ decays Berezhnoy, Alexander Lucha, Wolfgang Melikhov, Dmitri High Energy Physics - Phenomenology Within the hypothesis of the dark-matter origin of the excess in $B\to K M_X$ decays over the standard-model expectation, observed by Belle-II, we show that: (i) Scalar- and vector-medator scenarios may be unambiguously discriminated by measuring the differential distributions in $B\to K M_X$ and $B\to K^* M_X$ decays. (ii) Combining the available data on $Γ(B\to K M_X)$ and the upper limit on $Γ(B\to K^* M_X)$ provides a tight constraint on the vector mediator mass $M_V\lesssim 3$ GeV. At the same time, no constraints on the scalar-mediator mass are imposed by these data. (iii) Both scalar- and vector-mediator scenarios allow a good description of the differential distributions in $B\to K M_X$ measured by Belle-II and an extraction of dark-model parameters within both scenarios. |
| title | Probing vector- vs scalar-mediator dark-matter scenarios in $B\to (K,K^*) M_X$ decays |
| topic | High Energy Physics - Phenomenology |
| url | https://arxiv.org/abs/2507.10801 |