Probing triple-Higgs productions via4b2γdecay channel at a 100 TeV hadron collider

Abstract

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 ILC at a few TeV because of its extremely small production rate. In this paper, we present a detailed MC 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 → bbbbγγ, investigating detector effects and optimizing the kinematic cuts to discriminate the signal 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 × 10 4 ab −1 . We also explore the dependence of the cross section upon the trilinear (λ 3 ) and quartic (λ 4 ) self-couplings of the Higgs. We find that, through a search in the triple Higgs production, the parameters λ 3 and λ 4 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).

Self-coupling of the Higgs boson in the processespp→ZHHH+Xandpp→WHHDicus1, Kao2, Repko3 2016Phys. Rev. D12080View full textAdd to dashboardCite

“…In general the problem of determining κ 4 will be very difficult. Similar conclusions have been reached by Binoth, Karg, Kauer, and Rückl [23] and others [24][25][26] for the gluon fusion process gg → HHH. …”

Determining the shape of the Higgs potential at future colliders

“…This is because, the quartic coupling appears in a very diagrams which make very small contribution to the total cross section. The quartic Higgs coupling is only constrained in the ranges of [−20, 30] (at the 2σ CL) by three Higgs production at the 100 TeV hadron collider with 30 fb −1 data [99]. In another approach, there have been attempts to measure trilinear and quartic Higgs couplings indirectly using higher order loop corrections [75,104,105].…”

“…existing collider simulations as the benchmark point and perform scaling to obtain the signal significance in various scenarios. For the benchmark point, it is already shown in the literature that we need an extremely large luminosity, at the order of 1.8 × 10 4 ab −1 [99], to discover the process of triple-Higgs production pp → hhh, for the SM, at the 100 TeV hadron collider. This is because of the extremely large background, as compared to the signal.…”

The Higgs trilinear coupling and the scale of new physics

“…Future high energy lepton or hadron colliders are required for a more accurate determination with potential sensitivity at the 10% level [13][14][15]. In comparison, even at future colliders, triple Higgs production is not sensitive to the Standard Model prediction, but can be sensitive to large enough modifications [16,17]. For a recent review on collider Higgs probes, see [18].…”