1 Search Results

We report that the quartic self-coupling of the Standard Model Higgs boson can only be measured by observing the triple-Higgs production process, but it is challenging for the LHC Run 2 or International Linear Collider (ILC) at a few TeV because of its extremely small production rate. In this paper, we present a detailed Monte Carlo simulation study of the triple-Higgs production through gluon fusion at a 100 TeV hadron collider and explore the feasibility of observing this production mode. We focus on the decay channel HHH →$$b\bar{b}$$$$b\bar{b}$$γγ, investigating detector effects and optimizing the kinematic cuts to discriminate the signalmore » from the backgrounds. Our study shows that, in order to observe the Standard Model triple-Higgs signal, the integrated luminosity of a 100 TeV hadron collider should be greater than 1.8×10⁴ ab^₋1. We also explore the dependence of the cross section upon the trilinear (λ₃) and quartic (λ₄) self-couplings of the Higgs. Ultimately, we find that, through a search in the triple-Higgs production, the parameters λ₃ and λ₄ can be restricted to the ranges [₋1,5] and [₋20,30], respectively. We also examine how new physics can change the production rate of triple-Higgs events. For example, in the singlet extension of the Standard Model, we find that the triple-Higgs production rate can be increased by a factor of O(10).« less