Lepton flavor violating decays τ → Pl in the U(1)XSSM model

Abstract

U(1)XSSM is the extension of the minimal supersymmetric standard model (MSSM) and its local gauge group is SU(3)C × SU(2)L × U(1)Y × U(1)X. To obtain this model, three singlet new Higgs superfields and right-handed neutrinos are added to MSSM. In the framework of U(1)XSSM, we study lepton flavor violating decays τ → Pl( P = π, η, η′; l = μ, e). According to the latest experimental data of τ → Pe and τ → Pμ, the influence of different sensitive parameters on the results is analyzed to make a reasonable prediction for future experiments. From the numerical analysis, the non-diagonal elements which correspond to the generations of the initial lepton and final lepton are main sensitive parameters and lepton flavor violation (LFV) sources. This work can provide a basis for finding the existence of new physics (NP).

B 0— B¯0 mixing in the U(1) X SSM

“…U(1) X SSM has new superfields beyond MSSM, including three Higgs singlets ˆ¯ĥ h S , , , and right-handed neutrinos ni . In order to obtain Higgs boson mass of 125.1 GeV, it is necessary to consider loop correction [28][29][30]. The particle content and charge distribution of U(1) X SSM can be found in previous study [31].…”

“…We use the 'top-down' method to derive the formulas of neutrino mass and mixing angle from the effective neutrino mass matrix [28].…”

A Study of the Higgs Mass with the Effective Potential and Higgs Decays in the U(1)XSSM

“…The new mixing of Higgs can improve the lightest CP-even Higgs mass at the tree level. One can find the particle contents in [8,18].…”

“…Two mixing angles θ W and θ W [9,18] are used here. Supposing µ, λ H , λ C , l W , M S , B µ , L S , T κ , T λ C , T λ H , κ, B S as real parameters, we show the simplified Higgs potential at the tree level [8]:…”