# Effective Field Theory after a New-Physics Discovery

## TL;DR

This paper develops an effective field theory framework using SCET to describe the couplings of a new scalar resonance to the Standard Model after its discovery, including resummation of Sudakov logarithms.

## Contribution

It constructs the operator basis for the effective theory of a scalar resonance and performs resummation of leading Sudakov logarithms, advancing theoretical tools for new physics analysis.

## Key findings

- Operator basis for scalar resonance effective theory established
- Resummation of leading Sudakov logarithms performed
- Framework aids interpretation of future resonance discoveries

## Abstract

After the discovery of a new resonance, its couplings to the Standard Model (SM) need to be described by the means of an effective theory, appropriately constructed to separate its mass scale from the mass scales associated with the SM decay products. At the example of a scalar resonance transforming as a singlet under the SM gauge group, we construct the operator basis for such a theory using the language of Soft-Collinear Effective Theory (SCET) and perform the resummation of the leading Sudakov logarithms.