Top-quark mass effects in double and triple Higgs production in gluon-gluon fusion at NLO

In this paper we compute the QCD corrections for the triple Higgs boson production cross section via gluon fusion, within the heavy-top approximation. We present, for the first time, analytical results for the next-to-leading order corrections, and also compute the soft and virtual contributions of the next-to-next-to-leading order cross section. We provide predictions for the total cross section and the triple Higgs invariant mass distribution. We find that the QCD corrections are large at both perturbative orders, and that the scale uncertainty is substantially reduced when the second order perturbative corrections are included.

Section: Phenomenological Resultsmentioning

confidence: 71%

Section: Phenomenological Resultsmentioning

confidence: 99%

Section: Phenomenological Resultsmentioning

confidence: 99%

“…[7], which include the exact real corrections, to better than a 10%. Based on that, and on the level of accuracy of the results of ref.…”

Section: Jhep02(2017)107mentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

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Two-loop corrections to the triple Higgs boson production cross section

Mazzitelli

2017

On top quark mass effects to gg → ZH at NLO

Hasselhuhn

Luthe

Steinhauser

2017

Abstract:We compute next-to-leading order QCD corrections to the process gg → ZH. In the effective-theory approach we confirm the results in the literature. We consider top quark mass corrections via an asymptotic expansion and show that there is a good convergence below the top quark threshold which describes approximately a quarter of the total cross section. Our corrections are implemented in the publicly available C++ program ggzh.

Search for resonant and nonresonant Higgs boson pair production in the b b ¯ ℓνℓν $$ \mathrm{b}\overline{\mathrm{b}}\mathit{\ell \nu \ell \nu } $$ final state in proton-proton collisions at s = 13 $$ \sqrt{s}=13 $$ TeV

Sirunyan

Tumasyan

Adam

et al. 2018

Searches for resonant and nonresonant pair-produced Higgs bosons (HH) decaying respectively into ν ν, through either W or Z bosons, and bb are presented. The analyses are based on a sample of proton-proton collisions at √ s = 13 TeV, collected by the CMS experiment at the LHC, corresponding to an integrated luminosity of 35.9 fb −1 . Data and predictions from the standard model are in agreement within uncertainties. For the standard model HH hypothesis, the data exclude at 95% confidence level a product of the production cross section and branching fraction larger than 72 fb, corresponding to 79 times the standard model prediction. Constraints are placed on different scenarios considering anomalous couplings, which could affect the rate and kinematics of HH production. Upper limits at 95% confidence level are set on the production cross section of narrowwidth spin-0 and spin-2 particles decaying to Higgs boson pairs, the latter produced with minimal gravity-like coupling.Keywords: Hadron-Hadron scattering (experiments), Higgs physics The CMS collaboration 23 IntroductionThe Brout-Englert-Higgs mechanism is a key element of the standard model (SM) of elementary particles and their interactions, explaining the origin of mass through spontaneous breaking of electroweak symmetry [1][2][3][4][5][6]. The discovery of a Higgs boson with a mass m H around 125 GeV by the ATLAS and CMS experiments [7][8][9] fixes the value, in the SM, of the self-coupling λ in the scalar potential, whose shape is determined by the symmetries of the SM and the requirement of renormalisability. Direct information on the Higgs threeand four-point interactions will provide an indication of the scalar potential structure. Nonresonant Higgs boson pair production (HH) can be used to directly study the Higgs boson self-coupling. At the CERN LHC, Higgs boson pairs are predominantly produced through gluon-gluon fusion via two destructively interfering diagrams, shown in figure 1. In the SM the destructive interference between these two diagrams makes the observation of HH production extremely challenging, even in the most optimistic scenarios of energy and integrated luminosity at the future High Luminosity LHC [10,11]. The SM cross section for HH production in proton-proton collisions at √ s = 13 TeV for a Higgs boson mass of 125 GeV is σ HH = 33.5 fb at next-to-next-to-leading order (NNLO) in quantum chromodynamics (QCD) for the gluon-gluon fusion process [12][13][14][15][16][17][18][19][20][21].-1 - JHEP01(2018)054Indirect effects at the electroweak scale arising from beyond the standard model (BSM) phenomena at a higher scale can be parameterised in an effective field theory framework [22][23][24] by introducing coupling modifiers for the SM parameters involved in HH production, namely κ λ = λ/λ SM for the Higgs boson self-coupling λ and κ t = y t /y t SM for the top quark Yukawa coupling y t . Such modifications of the Higgs boson couplings could enhance Higgs boson pair production to rates observable with the current dataset. The re...