Study muon g-2 at two-loop level in the $U(1)_X$SSM

TL;DR

This paper investigates the muon g-2 anomaly within the $U(1)_X$SSM model, calculating electroweak two-loop corrections involving supersymmetric particles to explain the observed deviation from the standard model.

Contribution

It provides a detailed calculation of two-loop electroweak corrections in the $U(1)_X$SSM, including Barr-Zee, rainbow, and diamond diagrams, to account for muon g-2.

Findings

Two-loop corrections can reach $25\times 10^{-10}$ or more.

Supersymmetric particles contribute significantly to the muon g-2.

Results support the viability of $U(1)_X$SSM in explaining the anomaly.

Abstract

The new experiment data of muon g-2 is reported by the workers at Fermilab National Accelerator Laboratory(FNAL). Combined with the previous Brookhaven National Laboratory(BNL) E821 result, the departure from the standard model prediction is about 4.2 $\sigma$. It strengthens our faith in the new physics. $U(1)_X$SSM is the U(1) extension of the minimal supersymmetric standard model, where we study the electroweak corrections to the anomalous magnetic dipole moment of muon from the one-loop diagrams and some two-loop diagrams possessing important contributions. These two-loop diagrams include Barr-Zee type, rainbow type and diamond type. The virtual supersymmetric particles in these two-loop diagrams are chargino, scalar neutrino, neutralino, scalar lepton, which are supposed not very heavy to make relatively large corrections. We obtain the Wilson coefficients of the dimension 6 operators inducing the anomalous magnetic dipole moment of muon. The numerical results can reach $25\times 10^{-10}$ and even larger.