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- W2990403602 abstract "Excited beryllium has been observed to decay into electron-positron pairs with a $6.8~sigma$ anomaly. The process is properly explained by a 17 MeV proto-phobic vector boson. In present work, we consider a family-nonuniversal $U(1)^{prime}$ that is populated by a $U(1)^{prime}$ gauge boson $Z^prime$ and a scalar field $S$, charged under $U(1)^{prime}$ and singlet under the Standard Model (SM) gauge symmetry. The SM chiral fermion and scalar fields are charged under $U(1)^{prime}$ and we provide them to satisfy the anomaly-free conditions. The Cabibbo-Kobayashi-Maskawa (CKM) matrix is reproduced correctly by higher-dimension Yukawa interactions facilitated by $S$. The vector and axial-vector current couplings of the $Z^prime$ boson to the first generation of fermions do satisfy all the bounds from the various experimental data. The $Z^prime$ boson can have kinetic mixing with the hypercharge gauge boson and $S$ can directly couple to the SM-like Higgs field. The kinetic mixing of $Z^prime$ with the hypercharge gauge boson, as we show by a detailed analysis, generates the observed beryllium anomaly. We find that beryllium anomaly can be properly explained by a MeV-scale sector with a minimal new field content. The minimal model we construct forms a framework in which various anomalous SM decays can be discussed." @default.
- W2990403602 created "2019-12-05" @default.
- W2990403602 creator A5017505205 @default.
- W2990403602 date "2019-11-24" @default.
- W2990403602 modified "2023-10-16" @default.
- W2990403602 title "A Family-nonuniversal $U(1)^prime$ Model for Excited Beryllium Decays." @default.
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