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| Main Author: | |
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| Format: | Preprint |
| Published: |
2024
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2412.11438 |
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| _version_ | 1866909430295035904 |
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| author | Rashed, Ahmed |
| author_facet | Rashed, Ahmed |
| contents | The study investigates flavor-changing neutral current (FCNC) decays of $B$ and $K$ mesons in the context of a dark $U(1)_D$ model with a dark photon/dark $Z$ mass between 10 MeV and 2 GeV. While the model improves the fit to certain decay distributions, such as $B \to K^{(*)} \ell^+ \ell^- $ and $ B_s \to ϕμ^+ μ^- $, it is ruled out by stringent experimental constraints, including atomic parity violation, $K^+ \to μ^+ + \text{invisible} $, and $ B_s - \overline{B}_s $ mixing. To address these constraints, the model is extended with three modifications; allowing additional invisible decays of $ Z_D $, introducing a direct vector coupling of $ Z_D $ to muons, and including a direct coupling of $ Z_D $ to both muons and electrons, with fine-tuning to cancel the mixing-induced coupling to electrons. Among these extensions, only the third scenario, involving fine-tuned electron coupling, remains consistent with all experimental constraints. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2412_11438 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Constraints on Dark Photon and Dark $Z$ Model Parameters in the $B$ and $K$ Meson Decays Rashed, Ahmed High Energy Physics - Phenomenology The study investigates flavor-changing neutral current (FCNC) decays of $B$ and $K$ mesons in the context of a dark $U(1)_D$ model with a dark photon/dark $Z$ mass between 10 MeV and 2 GeV. While the model improves the fit to certain decay distributions, such as $B \to K^{(*)} \ell^+ \ell^- $ and $ B_s \to ϕμ^+ μ^- $, it is ruled out by stringent experimental constraints, including atomic parity violation, $K^+ \to μ^+ + \text{invisible} $, and $ B_s - \overline{B}_s $ mixing. To address these constraints, the model is extended with three modifications; allowing additional invisible decays of $ Z_D $, introducing a direct vector coupling of $ Z_D $ to muons, and including a direct coupling of $ Z_D $ to both muons and electrons, with fine-tuning to cancel the mixing-induced coupling to electrons. Among these extensions, only the third scenario, involving fine-tuned electron coupling, remains consistent with all experimental constraints. |
| title | Constraints on Dark Photon and Dark $Z$ Model Parameters in the $B$ and $K$ Meson Decays |
| topic | High Energy Physics - Phenomenology |
| url | https://arxiv.org/abs/2412.11438 |