New rare meson decay constraints on a light vector in $U(1)_{B-L}, U(1)_R$ and the dark photon
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| Format: | Preprint |
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2025
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| _version_ | 1866912624628727808 |
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| author | Seto, Osamu Shimomura, Takashi Yoshida, Shinsuke |
| author_facet | Seto, Osamu Shimomura, Takashi Yoshida, Shinsuke |
| contents | We evaluate constraints from flavor changing rare meson decays to a light vector boson $X$, followed by the decay of the on-shell $X$ into the SM fermions. The flavor changing meson decay emitting the light $X$ is induced by loop processes where the up-type quarks, the $W$ boson, or charged scalar bosons are running inside loops. We calculate all one-loop diagrams with neglecting all masses of light quarks except for the top quark in a general anomaly free extra $U(1)$ model. Our theoretical evaluation of the branching ratio of charged $B$ meson decay and charged kaon decay is compared to experimental results, and we derive new constraints for dark photon, $U(1)_{B-L}$ and $U(1)_R$ models. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2504_15896 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | New rare meson decay constraints on a light vector in $U(1)_{B-L}, U(1)_R$ and the dark photon Seto, Osamu Shimomura, Takashi Yoshida, Shinsuke High Energy Physics - Phenomenology We evaluate constraints from flavor changing rare meson decays to a light vector boson $X$, followed by the decay of the on-shell $X$ into the SM fermions. The flavor changing meson decay emitting the light $X$ is induced by loop processes where the up-type quarks, the $W$ boson, or charged scalar bosons are running inside loops. We calculate all one-loop diagrams with neglecting all masses of light quarks except for the top quark in a general anomaly free extra $U(1)$ model. Our theoretical evaluation of the branching ratio of charged $B$ meson decay and charged kaon decay is compared to experimental results, and we derive new constraints for dark photon, $U(1)_{B-L}$ and $U(1)_R$ models. |
| title | New rare meson decay constraints on a light vector in $U(1)_{B-L}, U(1)_R$ and the dark photon |
| topic | High Energy Physics - Phenomenology |
| url | https://arxiv.org/abs/2504.15896 |