  CoDEx is a Mathematica package that calculates the Wilson Coefficients (WCs)
corresponding to effective operators up to mass dimension-6. Once the part of
the Lagrangian involving single as well as multiple degenerate heavy fields,
belonging to some Beyond Standard Model (BSM) theory, is given, the package can
then integrate out propagators from the tree as well as 1-loop diagrams of that
BSM theory. It then computes the associated WCs up to 1-loop level, for two
different bases: "Warsaw" and "SILH". CoDEx requires only very basic
information about the heavy field(s), e.g., Colour, Isospin, Hyper-charge,
Mass, and Spin. The package first calculates the WCs at the high scale (mass of
the heavy field(s)). We then have an option to perform the renormalisation
group evolutions (RGEs) of these operators in "Warsaw" basis, a complete one
(unlike "SILH"), using the anomalous dimension matrix. Thus, one can get all
effective operators at the electro-weak scale, generated from any such BSM
theory, containing heavy fields of spin: 0, 1/2, and 1. We have provided many
example models (both here and in the package-documentation) that more or less
encompass different choices of heavy fields and interactions. Relying on the
status of the present day precision data, we restrict ourselves up to
dimension-6 effective operators. This will be generalised for any dimensional
operators in a later version. Site: https://effexteam.github.io/CoDEx
