Double Higgs boson production and decay in Randall-Sundrum model at hadron colliders

TL;DR

This paper explores double Higgs production at future colliders within the Randall-Sundrum model, highlighting how KK gravitons influence cross sections and distributions, and identifying conditions for experimental detection.

Contribution

It provides the first detailed analysis of double Higgs production in the RS model at high-energy colliders, focusing on KK graviton effects and parameter dependencies.

Findings

RS effects are significant near KK graviton masses

Proper kinematic cuts can isolate RS signals from background

Cross section decreases with increasing KK graviton mass or decreasing coupling

Abstract

We investigate the double Higgs production and decay at the $14~ {\rm TeV}$ LHC and $33~ {\rm TeV}$ HE-LHC in both the standard model and Randall-Sundrum (RS) model. In our calculation we consider reasonably only the contribution of the lightest two Kaluza-Klein (KK) gravitons. We present the integrated cross sections and some kinematic distributions in both models. Our results show that the RS effect in the vicinities of $M_{HH} \sim M_{1}$, $M_{2}$ (the masses of the lightest two KK gravitons) or in the central Higgs rapidity region is quite significant, and can be extracted from the heavy SM background by imposing proper kinematic cuts on final particles. We also study the dependence of the cross section on the RS model parameters, the first KK graviton mass $M_1$ and the effective coupling $c_0$, and find that the RS effect is reduced obviously with the increment of $M_1$ or decrement of $c_0$.