Test of Higgs boson compositeness in $ZH$ production through gluon-gluon and photon-photon collisions

TL;DR

This paper investigates how potential compositeness of the Higgs boson and Z boson could significantly alter the energy dependence of ZH production in gluon-gluon and photon-photon collisions, providing a way to test for new physics.

Contribution

It introduces test form factors for Higgs and Z boson compositeness and calculates their impact on differential cross sections and Z_L production fractions.

Findings

Compositeness effects cause large deviations from Standard Model predictions.

Energy dependence of amplitudes is significantly modified by compositeness.

Potential to detect compositeness through differential cross section measurements.

Abstract

In the spirit of the Composite Standard Model (CSM) we look at the effect of $H$, $Z_L$ compositeness on $ZH$ production in gluon-gluon and photon-photon collisions. Because they would perturb the basic cancellations occuring in SM amplitudes, such compositeness effects would lead to spectacular modifications of the energy dependence of the amplitudes and cross sections. We illustrate this fact by introducing $H$, $Z_L$ test form factors and computing the corresponding differential cross section and the fraction of longitudinal $Z_L$ production.