# Higgs decay into four charged leptons in the presence of dimension-six operators

## TL;DR

This paper investigates how dimension-six operators in Effective Field Theory affect Higgs decay into four leptons, providing tools and analysis methods for future precise measurements at the LHC.

## Contribution

It introduces an improved event generator for EFT predictions in Higgs to four lepton decays and assesses the impact of differential observables on future LHC analyses.

## Key findings

- EFT operators induce measurable deviations in decay width and kinematic distributions.
- Inclusion of differential information enhances sensitivity to new physics effects.
- The improved generator facilitates EFT-based data analysis at the LHC.

## Abstract

We study the indirect effects of New Physics in the Higgs decay into four charged leptons, using an Effective Field Theory (EFT) approach to Higgs interactions. We evaluate the deviations induced by the EFT dimension-six operators in observables like partial decay width and various kinematic distributions, including angular observables, and compare them with the contribution of the full SM electroweak corrections. The calculation is implemented in an improved version of the event generator Hto4l, which can provide predictions in terms of different EFT-bases and is available for data analysis at the LHC. We also perform a phenomenological study in order to assess the benefits coming from the inclusion of differential information in the future analyses of very precise data which will be collected during the high luminosity phase of the LHC.