Constraints on Dark Photon and Dark $Z$ Model Parameters in the $B$ and $K$ Meson Decays
| Autor: | Rashed, Ahmed |
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| Rok vydání: | 2024 |
| Předmět: | |
| Druh dokumentu: | Working Paper |
| Popis: | 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 \phi \mu^+ \mu^- $, it is ruled out by stringent experimental constraints, including atomic parity violation, $K^+ \to \mu^+ + \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. Comment: 17 pages, 1 table, 14 figures |
| Databáze: | arXiv |
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