https://scholars.lib.ntu.edu.tw/handle/123456789/626541
標題: | Lepton flavor violation and scotogenic Majorana neutrino mass in a Stueckelberg $U(1)_X$ model | 作者: | Chuan-Hung Chen CHENG-WEI CHIANG Takaaki Nomura Chun-Wei Su |
關鍵字: | Lepton Flavour Violation (charged); Models for Dark Matter; Neutrino Mixing; New Gauge Interactions; CONVERSION; PHYSICS; MUONIUM; High Energy Physics - Phenomenology; High Energy Physics - Phenomenology; High Energy Physics - Experiment | 公開日期: | 26-一月-2022 | 出版社: | SPRINGER | 卷: | 2022 | 期: | 9 | 來源出版物: | JOURNAL OF HIGH ENERGY PHYSICS | 摘要: | We construct a scotogenic Majorana neutrino mass model in a gauged $U(1)_X$ extension of the standard model, where the mass of the gauge boson and the unbroken gauge symmetry, which leads to a stable dark matter (DM), can be achieved through the Stueckelberg mechanism. It is found that the simplest version of the extended model consists of the two inert-Higgs doublets and one vector-like singlet fermion. In addition to the Majorana neutrino mass, we study the lepton flavor violation (LFV) processes, such as $\ell_i \to \ell_j \gamma$, $\ell_i \to 3 \ell_j$, $\mu-e$ conversion rate in nucleus, and muonium-antimuonium oscillation. We show that the sensitivities of $\mu\to 3e$ and $\mu-e$ conversion rate designed in Mu3e and COMET/Mu2e experiments make both decays the most severe constraints on the $\mu\to e$ LFV processes. It is found that $\tau\to \mu \gamma$ and $\tau\to 3\mu$ can reach the designed significance level of Belle II. In addition to explaining the DM relic density, we also show that the DM-nucleon scattering cross section can satisfy the currently experimental limit of DM direct detection. |
描述: | 31 pages, 12 figures |
URI: | https://scholars.lib.ntu.edu.tw/handle/123456789/626541 | ISSN: | 1029-8479 | DOI: | 10.1007/JHEP09(2022)166 |
顯示於: | 物理學系 |
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