Triple Higgs boson production at a 100 TeV proton-proton collider

We present a sensitivity study on the cubic and quartic self couplings in double Higgs production via gluon fusion at hadron colliders. Considering the relevant operators in the Standard Model Effective Field Theory up to dimension eight, we calculate the dominant contributions up to two-loop level, where the first dependence on the quartic interaction appears. Our approach allows to study the independent variations of the two self couplings and to clearly identify the terms necessary to satisfy gauge invariance and to obtain UVfinite results order by order in perturbation theory. We focus on the bbγγ signature for simplicity and provide the expected bounds for the cubic and quartic self couplings at the 14 TeV LHC with 3000 fb −1 (HL-LHC) and for a future 100 TeV collider (FCC-100) with 30 ab −1 . We find that while the HL-LHC will provide very limited sensitivity on the quartic self coupling, precision measurements of double Higgs production at a FCC-100 will offer the opportunity to set competitive bounds. We show that combining information from double and triple Higgs production leads to significantly improved prospects for the determination of the quartic self coupling.

Section: Scenariomentioning

confidence: 81%

Probing the scalar potential via double Higgs boson production at hadron colliders

Borowka

Duhr

Maltoni

et al. 2019

“…Moreover, values outside the interval [0.1, 1.9] [42] can be probed in a future FCC-ee facility [44]. Likewise, searches for double-Higgs and triple-Higgs production at future hadron colliders might also constrain λ 4 [45]. The reach of the different facilities is shown in the left panel of Fig.…”

Section: Interplay Between Gravitational Wave Signatures and Higgs-sementioning

confidence: 99%

Signals of the electroweak phase transition at colliders and gravitational wave observatories

Chala

Krause

Nardini

2018

107

If the electroweak phase transition (EWPT) is of strongly first order due to higher dimensional operators, the scale of new physics generating them is at the TeV scale or below. In this case the effective-field theory (EFT) neglecting operators of dimension higher than six may overlook terms that are relevant for the EWPT analysis. In this article we study the EWPT in the EFT to dimension eight. We estimate the reach of the future gravitational wave observatory LISA for probing the region in which the EWPT is strongly first order and compare it with the capabilities of the Higgs measurements via doubleHiggs production at current and future colliders. We also match different UV models to the previously mentioned dimension-eight EFT and demonstrate that, from the top-down point of view, the double-Higgs production is not the best signal to explore these scenarios.

“…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].…”

Section: Introductionmentioning

confidence: 99%

The Higgs trilinear coupling and the scale of new physics

Chang

Luty

2020

We consider modifications of the Higgs potential due to new physics at high energy scales. These upset delicate cancellations predicted by the Standard Model for processes involving Higgs bosons and longitudinal gauge bosons, and lead to a breakdown of the theory at high energies. We focus on modifications of the Higgs trilinear coupling and use the violation of treelevel unitarity as an estimate of the scale where the theory breaks down. We obtain a completely model-independent bound of < ∼ 13 TeV for an order-1 modification of the trilinear. We argue that this bound can be saturated only in fine-tuned models, and the scale of new physics is likely to be much lower. The most stringent bounds are obtained from amplitudes involving multiparticle states that are not conventional scattering states. Our results show that a future determination of the Higgs cubic coupling can point to a well-defined scale of new physics that can be targeted and explored at future colliders.