2023/11/23 by Sumit Ghosh, Ghosh, Sumit, Pyungwon Ko +1
Physics and Astronomy · #Dark Matter and Cosmic Phenomena #FOS: Physical sciences #High Energy Physics - Phenomenology (hep-ph) #Neutrino Physics Research #Particle physics theoretical and experimental studies
paper · pdf · doi:10.48550/arxiv.2311.14099
openalex publication_date 2023/11/23 · openalex created_date 2023/11/28 · openalex updated_date 2026/07/28
We consider U(1)H extensions of Type-I 2HDM plus a singlet scalar ϕH, introducing a new Higgs doublet H2 and a singlet ϕH charged under U(1)H. The SM Higgs doublet H1 as well as all the SM fermions and three right-handed singlet neutrinos, introduced to generate nonzero neutrino masses and mixings, are neutral under U(1)H. We also introduce a SM singlet Dirac fermion, charged under U(1)H and utilize it as sterile neutrinos relevant to the MiniBooNE experiment. The U(1)H symmetry breaks due to the vacuum expectation values of H2 and ϕH, leading to the emergence of a light vector boson with a mass of approximately 17 MeV. This vector boson interacts with fermions through mass mixing and kinetic mixing process involving other neutral gauge bosons. Furthermore, alongside the light vector boson, another light scalar particle with a mass around 10--100 MeV may arise from scalar sector mixing. By utilizing the gauge couplings of the light vector boson and the Yukawa couplings of the light scalar, this model can simultaneously provide an explanation for the Beryllium anomaly observed in the ATOMKI experiment, the anomalous magnetic moment of charged leptons and the excess of electron-like events detected at the MiniBooNE experiment.