Precise predictions for trilinear Higgs couplings and Higgs pair production in extended scalar sectors with anyH3 and anyHH

TL;DR

This paper introduces the latest version of the public tool anyBSM, enabling automated, precise one-loop calculations of all trilinear scalar couplings and di-Higgs production in extended scalar sectors for BSM theories.

Contribution

The paper presents an updated, flexible computational tool for accurate one-loop predictions of Higgs self-couplings and pair production in arbitrary BSM models with extended scalar sectors.

Findings

Provides full one-loop order calculations with momentum dependence

Includes a new module for di-Higgs production in gluon fusion

Applicable to models with multiple scalar resonances

Abstract

A central objective of future collider experiments is to probe the structure of the Higgs potential, which requires access to trilinear scalar couplings, in particular the self-coupling of the observed Higgs boson. While this coupling is fixed in the Standard Model (SM), it can receive sizable modifications in many Beyond the SM (BSM) scenarios, often connected to solutions of open problems such as the origin of the matter-antimatter asymmetry of the Universe. In theories with extended scalar sectors, radiative corrections involving additional scalar states can significantly affect both the Higgs self-coupling and other trilinear scalar interactions, with important consequences for predictions of physical observables. Precise theoretical calculations are therefore essential for the interpretation of precision Higgs measurements and for identifying indirect signatures of new physics. This contribution presents the latest version of the public tool anyBSM, which provides automated calculations of all trilinear scalar couplings at full one-loop order in arbitrary renormalisable theories, including full momentum dependence and flexible renormalisation-scheme choices. In addition, the new module anyHH for di-Higgs production in gluon fusion is discussed in several exemplary BSM models, including scenarios with multiple resonances.