Proposal for the validation of Monte Carlo implementations of the standard model effective field theory

TL;DR

This paper introduces a method to validate Monte Carlo simulations of the standard model effective field theory by comparing squared amplitudes at specific points, ensuring consistency across different implementations.

Contribution

It presents a systematic procedure for cross-validating Monte Carlo implementations of the SMEFT, including linearisation and amplitude comparison techniques.

Findings

Comparison of multiple SMEFT implementations completed

Method applicable at tree level and extendable to one-loop level

Establishes a standard validation protocol for SMEFT simulations

Abstract

We propose a procedure to cross-validate Monte Carlo implementations of the standard model effective field theory. It is based on the numerical comparison of squared amplitudes computed at specific phase-space and parameter points in pairs of implementations. Interactions are fully linearised in the effective field theory expansion. The squares of linear effective field theory amplitudes and their interference with standard-model contributions are compared separately. Such pairwise comparisons are primarily performed at tree level and a possible extension to the one-loop level is also briefly considered. We list the current standard model effective field theory implementations and the comparisons performed to date.