Four-Quark Effective Operators at Hadron Colliders

TL;DR

This paper examines how effective four-quark operators at hadron colliders relate to underlying BSM theories, emphasizing the importance of energy scales and proposing a method to translate experimental limits to full models.

Contribution

It introduces a method to recast experimental limits on effective operators into the full BSM theory parameter space, considering energy scale effects.

Findings

Applicability of effective operators depends on the energy-to-mass ratio.

The analysis illustrates the impact of transfer energy on effective operator validity.

A recasting method links experimental limits to full BSM models.

Abstract

The robustness of translating effective operator constraints to BSM theories crucially depends on the mass and coupling of BSM particles. This is especially relevant for hadron colliders where the partonic centre of mass energy is around the typical energy scales of natural BSM theories. The caveats in applying the limits are discussed using Z' and G' models, illustrating the effects for a large class of models. This analysis shows that the applicability of effective operators mainly depends on the ratio of the transfer energy in the events and the mass scale of the full theory. Moreover, based on these results a method is developed to recast existing experimental limits on four-quark effective operators to the full theory parameter space.