Analyzing the magnitude of two loop corrections to the muon magnetic dipole moment in the mass insertion approximation

TL;DR

This paper evaluates the significance of two-loop supersymmetric corrections to the muon magnetic dipole moment using the mass insertion approximation, aiming to identify the most impactful diagrams amid experimental precision improvements.

Contribution

It introduces a systematic analysis of two-loop supersymmetric diagrams for muon MDM using the mass insertion approximation, simplifying the identification of dominant contributions.

Findings

Identified key two-loop diagrams contributing significantly to muon MDM

Provided a method to distinguish important diagrams from negligible ones

Enhanced understanding of supersymmetric effects on muon magnetic moment

Abstract

With the development of muon magnetic dipole moment (MDM) experiments, particularly the high-precision measurements at Fermilab National Accelerator Laboratory (FNAL), experimental data have become increasingly precise. Up to now, the deviation of muon MDM between the experimental data and the standard model prediction is still existing, which may be caused by the new physics contribution. The two loop supersymmetric diagrams can produce important corrections to muon MDM. For many two loop diagrams, we analyse the order of the contribution to select the important two loop diagrams and neglect the tiny one, which is in favor of distinguishing the important two loop diagrams from all the two loop diagrams. In our analysis, we use the mass insertion approximation. There is no rotation matrix during the study and the resulting factors become more intuitive, so the mass insertion method is more suitable for this study of ours.