# MassToMI—A Mathematica package for an automatic Mass Insertion expansion

## Description

Abstract We present a Mathematica package designed to automatize the expansion of transition amplitudes calculated in the mass eigenstates basis (i.e. expressed in terms of physical masses and mixing matrices) into series of “mass insertions”, defined as off-diagonal entries of mass matrices in Lagrangian before diagonalization and identification of the physical states. The algorithm implemented in this package is based on the general “Flavor Expansion Theorem” proven in Dedes et al. (2015). The suppl... Title of program: MassToMI v1.0 Catalogue Id: AEZF_v1_0 Nature of problem Automatized expansion of QFT transition amplitude calculated in mass eigenstates basis into power series of off-diagonal elements of mass matrices of the interaction basis Lagrangian. Versions of this program held in the CPC repository in Mendeley Data AEZF_v1_0; MassToMI v1.0; 10.1016/j.cpc.2015.12.011 This program has been imported from the CPC Program Library held at Queen's University Belfast (1969-2018)