A framework for Higgs characterisation

TL;DR

This paper presents a comprehensive framework using effective field theory to systematically analyze the properties of the recently discovered boson at the LHC across multiple channels, incorporating advanced simulation techniques.

Contribution

It introduces a novel, systematic approach for Higgs characterization that integrates effective field theory with state-of-the-art simulation methods for all relevant production and decay channels.

Findings

Beyond-leading-order QCD effects have significant phenomenological impacts.

The framework enables consistent and accurate characterization of the boson's properties.

Sample applications demonstrate the method's effectiveness in various scenarios.

Abstract

We introduce a framework, based on an effective field theory approach, that allows one to perform characterisation studies of the boson recently discovered at the LHC, for all the relevant channels and in a consistent, systematic and accurate way. The production and decay of such a boson with various spin and parity assignments can be simulated by means of multi-parton, tree-level matrix elements and of next-to-leading order QCD calculations, both matched with parton showers. Several sample applications are presented which show, in particular, that beyond-leading-order effects in QCD have non-trivial phenomenological implications.