Tests of Higgs boson compositeness through the HHH form factor

TL;DR

This paper demonstrates how the energy dependence of the triple Higgs boson form factor can indicate new physics, such as Higgs compositeness or additional particles, by analyzing deviations from Standard Model predictions.

Contribution

It provides analytic expressions for the high-energy behavior of the HHH form factor, including Standard Model corrections and potential new physics effects, enabling indirect detection of new phenomena.

Findings

High-energy SM corrections to the HHH form factor are accurately described by simple analytic formulas.

Deviations in the form factor's q^2-dependence can signal Higgs compositeness or new particles.

The approach allows probing new physics without direct particle detection.

Abstract

We show how the $q^2$-dependence of the triple Higgs boson HHH form factor can reveal the presence of various types of new physics contributions, like new particles coupled to the Higgs boson or Higgs boson constituents, without directly observing them. We compare the effect of such new contributions to the one of higher order SM corrections to the point-like HHH coupling, due to triangle, 4-leg and s.e. diagrams. We establish simple analytic expressions describing accurately at high energy these SM corrections, as well as the examples of new physics contributions.