Probing Higgs boson self-interactions in proton-proton collisions at a center-of-mass energy of 100 TeV

Fuks, Benjamin; Kim, Jeong Han; Lee, Seung Joon

doi:10.1103/physrevd.93.035026

Cited by 39 publications

(38 citation statements)

References 75 publications

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“…where λ H 3 (λ H 4 ) denotes the trilinear (quartic) Higgs self-coupling. While the quartic Higgs coupling λ H 4 cannot be probed directly at the LHC, due to the tiny size of the triple-Higgs production cross section [17][18][19][20][21] 1 , the trilinear Higgs coupling can be accessed directly in Higgs-pair production. Higgs-boson pairs are dominantly produced in the loop-induced gluon-fusion mechanism gg → HH that is mediated by top-quark loops supplemented by a per-cent-level contribution of bottom-quark loops, see Fig.…”

Section: Introductionmentioning

confidence: 99%

Higgs-pair production via gluon fusion at hadron colliders: NLO QCD corrections

Baglio¹,

Campanario

Glaus

et al. 2020

J. High Energ. Phys.

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Higgs-pair production via gluon fusion is the dominant production mechanism of Higgsboson pairs at hadron colliders. In this work, we present details of our numerical determination of the full next-to-leading-order (NLO) QCD corrections to the leading top-quark loops. Since gluon fusion is a loop-induced process at leading order, the NLO calculation requires the calculation of massive two-loop diagrams with up to four different mass/energy scales involved. With the current methods, this can only be done numerically, if no approximations are used. We discuss the setup and details of our numerical integration. This will be followed by a phenomenological analysis of the NLO corrections and their impact on the total cross section and the invariant Higgs-pair mass distribution. The last part of our work will be devoted to the determination of the residual theoretical uncertainties with special emphasis on the uncertainties originating from the scheme and scale dependence of the (virtual) top mass. The impact of the trilinear Higgs-coupling variation on the total cross section will be discussed.

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Section: Introductionmentioning

confidence: 99%

Higgs-pair production via gluon fusion at hadron colliders: NLO QCD corrections

Baglio¹,

Campanario

Glaus

et al. 2020

J. High Energ. Phys.

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“…Among all triple-Higgs production signatures, we make use of the bbbbτ + τ − channel with two hadronic tau decays to probe deviations in the Higgs self-interactions. Whilst the branching ratio is large (∼ 6.3%), the background contamination is expected to be important [14]. We however demonstrate in the next sections that previously overlooked advantages stemming from the usage of specific kinematic properties of the ditau systems and the potentially boosted configuration of the b-jet pairs could largely increase the signal significance.…”

Section: Theoretical Framework and Technical Detailsmentioning

confidence: 77%

“…We focus on the more challenging, branching-ratio-enhanced, bbbbτ + τ − signature. Contrary to the bbbbγγ channel, it receives a severe background contamination that yields a weaker expected sensitivity [14]. However, with the effort of exploiting previously overlooked advantages of the ditau system and a boosted configuration, we show in this work that the bbbbτ τ channel can be promoted to a leading discovery channel for triple-Higgs production.…”

Section: Introductionmentioning

confidence: 83%

“…Such a process faces a rather grim prospect at the LHC, mainly because of a small signal rate of O(0.1) fb [10][11][12], so that the study of this process is left to the experimental program of the post-LHC era that is currently under discussion at CERN and IHEP [13]. Feasibility analyses have so far shown that the bbbbγγ channel can be used to constrain the size of the quartic Higgs coupling in a modelindependent way, the interaction strength being allowed to deviate by a factor of at most O(10) from the SM after considering an integrated luminosity of 30 ab −1 [14][15][16]. The prospects of the bbW W W W decay mode have also been explored, and it was shown that a new physics triple-Higgs signal is in principle detectable [17].…”

Section: Introductionmentioning

confidence: 99%

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Scrutinizing the Higgs quartic coupling at a future 100 TeV proton–proton collider with taus and b-jets

2017

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The Higgs potential consists of an unexplored territory in which the electroweak symmetry breaking is triggered, and it is moreover directly related to the nature of the electroweak phase transition. Measuring the Higgs boson cubic and quartic couplings, or getting equivalently information on the exact shape of the Higgs potential, is therefore an essential task. However, direct measurements beyond the cubic self-interaction of the Higgs boson consist of a huge challenge, even for a future proton-proton collider expected to operate at a center-of-mass energy of 100 TeV. We present a novel approach to extract model-independent constraints on the triple and quartic Higgs self-coupling by investigating triple Higgs-boson hadroproduction at a center-of-mass energy of 100 TeV, focusing on the τ τ bbbb channel that was previously overlooked due to a supposedly too large background. It is thrown into sharp relief that the assist from transverse variables such as mT 2 and a boosted configuration ensures a high signal sensitivity. We derive the luminosities that would be required to constrain given deviations from the Standard Model in the Higgs self-interactions, showing for instance that a 2σ sensitivity could be achieved for an integrated luminosity of 30 ab −1 when Standard Model properties are assumed. With the prospects of combining these findings with other triple-Higgs search channels, the Standard Model Higgs quartic coupling could in principle be reached with a significance beyond the 3σ level.

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“…At a lepton collider, the situation is similar. At a high luminosity e + e − collider in the energy range between 500 GeV and 3 TeV, Higgs pair production becomes experimentally accessible [52,53], but the SM cross section for triple Higgs production in either e + e − → Z hhh or e + e − → ννhhh does not rise above 1 ab [54,55].At a 100 TeV hadron collider, triple-Higgs production via ggF can become observable in principle [56][57][58][59][60][61][62]. The cross section of g g → hhh at a 100 TeV hadron collider is estimated to 5 fb if NLO QCD corrections are included [56].…”

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confidence: 99%

Multi-Higgs boson production and unitarity in vector-boson fusion at future hadron colliders

et al. 2020

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We study multi-Higgs final states in vector boson fusion (VBF) processes at the LHC and at future proton-proton colliders, focusing on the prospects for measurements at 27 TeV and at 100 TeV. We use an effective Lagrangian which includes higher-dimensional operators in the mass eigenstates which are relevant to VBF processes and relate this to specific param-At the LHC, the dominant SM process of multi-Higgs production is gluon-gluon-fusion (ggF) via a heavy top-quark loop. Current LHC data constrain the triple Higgs self-coupling only very weakly [3], and not at all the quartic Higgs self-coupling. Multiple groups have evaluated the potential for a first meaningful measurement of the triple Higgs self-coupling at future highluminosity runs of the LHC [4-10]. The considered decay channels of the Higgs pair include and bbbb [18, 22, 23]. It is expected that the triple self-coupling can be constrained within 40% accuracy after collecting 3 ab −1 of data at the 14 TeV LHC [24]. There will be no access to the quartic self-coupling. Beyond the LHC, at a future 100 TeV hadron collider, the Higgs pair-production rate is enhanced significantly [9,13,[25][26][27][28][29][30], allowing for a more accurate determination of the Higgs potential.A subdominant process of multi-Higgs production in hadron collisions is vector-bosonfusion (VBF) [31], W + W − → hh, where the W bosons are effectively radiated from incoming quarks. In addition to its dependence on the Higgs self-interaction, this process also gives access to the hhW W coupling, which is another SM interaction that has not been accessible by other means. In fact, the hVV (V = W ± , Z ) couplings can be derived from the precise measurement of the decay branching fractions h → W W * and h → Z Z * at the LHC, up to a common normalization factor. The current LHC data on the decay branching fractions for these channels are consistent with the SM predictions [32, 33]. By contrast, there are no significant constraints from data on hhV V direct couplings.The VBF mode of double-Higgs production at hadron colliders has been studied in Refs. [34][35][36][37][38]. Beyond tree level, the NLO QCD correction enhances the cross section by ∼ 7% [39,40]. In the high-luminosity mode of the LHC (HL-LHC) with 3000 fb −1 at 14 TeV, the hhV V interaction can be constrained to 20%. A 100 TeV hadron collider has the potential to reduce the uncertainty down to 1% [37]. The hhW W coupling is also accessible in the W ± W ± h final state. In Ref. [41] it is found that this particular final state can constrain this coupling to O(100%) at the HL-LHC, and to 20% at a 100 TeV collider.The other modes of double Higgs production are tt hh or V hh production. The production rates of these mode are smaller than ggF and VBF mode. The discussion of these modes is beyond the scope of current work. For interested readers, we refer to [39,40,[42][43][44][45][46][47][48].Measuring the quartic Higgs self-coupling in the SM is a much more challenging task. At the 14 TeV LHC, the cross section of g g → hhh is onl...

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Probing Higgs boson self-interactions in proton-proton collisions at a center-of-mass energy of 100 TeV

Cited by 39 publications

References 75 publications

Higgs-pair production via gluon fusion at hadron colliders: NLO QCD corrections

Higgs-pair production via gluon fusion at hadron colliders: NLO QCD corrections

Scrutinizing the Higgs quartic coupling at a future 100 TeV proton–proton collider with taus and b-jets

Multi-Higgs boson production and unitarity in vector-boson fusion at future hadron colliders

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