The two-loop contributions to muon MDM in $U(1{)}_X$ SSM

Abstract

The MSSM is extended to the $U(1{)}_X$SSM, whose local gauge group is $SU(3{)}_C\times SU(2{)}_L\times U(1{)}_Y\times U(1{)}_X$. To obtain the $U(1{)}_X$SSM, we add the new superfields to the MSSM, namely: three Higgs singlets $\hat{\eta },\hat{\bar{\eta }},\hat{S}$ and right-handed neutrinos ${\hat{\nu }}_i$. 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 $U(1{)}_X$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 $7.4\times 10^{-10}$, which can remedy the deviation between SM prediction and experimental data to some extent.

arXiv comment23 pages, 8 figures

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• Light neutralino dark matter in $U(1{)}_X$SSM
• $Z$ boson decays $Z\to {l_i}^{\pm }{l_j}^{\mp }$ and Higgs boson decays $h\to {l_i}^{\pm }{l_j}^{\mp }$ with lepton flavor violation in a $U(1)$ extension of the MSSM
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