GM2Calc: Precise MSSM prediction for $(g - 2)$ of the muon

TL;DR

GM2Calc is a C++ tool that accurately calculates the MSSM contributions to the muon's anomalous magnetic moment, incorporating the latest two-loop corrections and flexible input options for detailed analysis.

Contribution

It introduces a precise, publicly available C++ program that includes advanced two-loop corrections and on-shell scheme calculations for MSSM $(g-2)_$ predictions.

Findings

Accurately computes MSSM contributions to $(g-2)_$ with two-loop corrections.

Supports high $ aneta$ values through resummation.

Allows flexible input and contribution toggling for detailed analysis.

Abstract

We present GM2Calc, a public C++ program for the calculation of MSSM contributions to the anomalous magnetic moment of the muon, $(g-2)_\mu$. The code computes $(g-2)_\mu$ precisely, by taking into account the latest two-loop corrections and by performing the calculation in a physical on-shell renormalization scheme. In particular the program includes a $\tan\beta$ resummation so that it is valid for arbitrarily high values of $\tan\beta$, as well as fermion/sfermion-loop corrections which lead to non-decoupling effects from heavy squarks. GM2Calc can be run with a standard SLHA input file, internally converting the input into on-shell parameters. Alternatively, input parameters may be specified directly in this on-shell scheme. In both cases the input file allows one to switch on/off individual contributions to study their relative impact. This paper also provides typical usage examples not only in conjunction with spectrum generators and plotting programs but also as C++ subroutines linked to other programs.