SMEFT operators in rare multi-top processes

TL;DR

This paper reviews how SMEFT operators are constrained using multi-top production processes, emphasizing the complementarity of channels and discussing theoretical issues like unitarity violation.

Contribution

It provides a comprehensive summary of recent studies constraining dimension-six Wilson coefficients through multi-top processes within the SMEFT framework.

Findings

Multiple channels offer complementary constraints on SMEFT operators.

Current analyses effectively limit Wilson coefficients using top-quark processes.

Discussion of unitarity issues highlights theoretical challenges.

Abstract

Nowadays, the Standard Model Effective Field Theory (SMEFT) provides a standard framework to parameterize potential deviations from the Standard Model and to combine information from multiple processes in global analyses. This review summarizes dedicated studies that constrain dimension-six Wilson coefficients using three top-quark and four top-quark production processes. We highlight the complementarity of these channels, as well as summarize the main problems and prospects in the area. A concise introduction to the SMEFT formalism and a discussion of the problem of potential perturbative unitarity violation are also provided.