# A Monte Carlo analysis of the SMEFT in the top quark sector

## TL;DR

This paper introduces SMEFiT, a Monte Carlo-based framework for global SMEFT analysis, demonstrating its application to top quark data from the LHC to derive and compare constraints on effective field theory parameters.

## Contribution

The paper develops SMEFiT, a novel Monte Carlo replica method framework for comprehensive SMEFT analysis, applied here to top quark measurements at the LHC.

## Key findings

- Derived bounds for 34 SMEFT parameters from LHC top data
- Compared new constraints with previous results
- Validated the SMEFiT methodology as effective for SMEFT analysis

## Abstract

We present a framework for carrying out global analyses of the Standard Model Effective Field Theory: SMEFiT. This approach is based on the Monte Carlo replica method, widely used in the case of NNPDF fits of the proton structure, for deriving a faithful estimate of the experimental and theoretical uncertainties. As a proof of concept of the SMEFiT methodology, we present a study of the constraints on the SMEFT provided by top quark production measurements from the LHC. We derive bounds for the 34 degrees of freedom relevant for the interpretation of the LHC top quark data and compare these bounds with previously reported constraints.