Regular Article - Theoretical Physics
The two-loop contributions to muon MDM in SSM
Department of Physics, Hebei University, 071002, Baoding, China
2 Key Laboratory of High-Precision Computation and Application of Quantum Field Theory of Hebei Province, 071002, Baoding, China
3 Department of Physics, Chongqing University, 401331, Chongqing, China
Accepted: 10 May 2021
Published online: 20 May 2021
The MSSM is extended to the SSM, whose local gauge group is . To obtain the SSM, we add the new superfields to the MSSM, namely: three Higgs singlets and right-handed neutrinos . It can give light neutrino tiny mass at the tree level through the seesaw mechanism. The study of the contribution of the two-loop diagrams to the MDM of muon under SSM provides the possibility for us to search for new physics. In the analytical calculation of the loop diagrams (one-loop and two-loop diagrams), the effective Lagrangian method is used to derive muon MDM. Here, the considered two-loop diagrams include Barr-Zee type diagrams and rainbow type two-loop diagrams, especially Z–Z rainbow two-loop diagram is taken into account. The obtained numerical results can reach , which can remedy the deviation between SM prediction and experimental data to some extent.
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