Probing the Higgs self coupling via single Higgs production at the LHC

Degrassi, Giuseppe; Giardino, Pier Paolo; Maltoni, Fabio; Pagani, Davide

doi:10.1007/jhep12(2016)080

Cited by 122 publications

(245 citation statements)

References 49 publications

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“…[65,66] for the case of top-quark pair production and in refs. [67][68][69] for the exchange of a virtual Higgs boson between an onshell Higgs boson and another on-shell heavy particle. The threshold region forces each tt, tt ortt pair to potentially lead to this kind of effect.…”

Section: Jhep02(2018)031mentioning

confidence: 99%

Large NLO corrections in t t ¯ W ± $$ t\overline{t}{W}^{\pm } $$ and

Frederix

Pagani

Zaro

2018

J. High Energ. Phys.

109

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Abstract:We calculate the complete-NLO predictions for ttW ± and tttt production in proton-proton collisions at 13 and 100 TeV. All the non-vanishing contributions of O(α i s α j ) with i + j = 3, 4 for ttW ± and i + j = 4, 5 for tttt are evaluated without any approximation. For ttW ± we find that, due to the presence of tW → tW scattering, at 13(100) TeV the O(α s α 3 ) contribution is about 12(70)% of the LO, i.e., it is larger than the so-called NLO EW corrections (the O(α 2 s α 2 ) terms) and has opposite sign. In the case of tttt production, large contributions from electroweak tt → tt scattering are already present at LO in the O(α 3 s α) and O(α 2 s α 2 ) terms. For the same reason we find that both NLO terms of O(α 4 s α), i.e., the NLO EW corrections, and O(α 3 s α 2 ) are large (±15% of the LO) and their relative contributions strongly depend on the values of the renormalisation and factorisation scales. However, large accidental cancellations are present (away from the threshold region) between these two contributions. Moreover, the NLO corrections strongly depend on the kinematics and are particularly large at the threshold, where even the relative contribution from O(α 2 s α 3 ) terms amounts to tens of percents.

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Section: Jhep02(2018)031mentioning

confidence: 99%

Large NLO corrections in t t ¯ W ± $$ t\overline{t}{W}^{\pm } $$ and

Frederix

Pagani

Zaro

2018

J. High Energ. Phys.

109

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“…As we do not consider precision studies [44][45][46][47][48] or di-Higgs constraints [49][50][51], we neglectc 6 . This list of operators is not exhausting all possibilities [52], but it provides a sufficiently general, while compu-tationally manageable, theoretical framework to gauge the sensitivity to BSM effects in the Higgs sector.…”

Section: Differential Higgs Fits and Uncertaintiesmentioning

confidence: 99%

Higgs characterisation in the presence of theoretical uncertainties and invisible decays

et al. 2017

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While the Higgs characterisation programme is well under way, direct signs for new physics beyond the Standard Model remain elusive. Performing a fit of fully differential Higgs production cross sections at the LHC to a subset of Higgs-relevant effective operators, we discuss the extent to which theoretical uncertainties can limit the sensitivity in such a new physics search programme. Extending the dimension-6 Higgs Effective Field Theory framework by introducing new light degrees of freedom that can contribute to an invisible (or undetectable) Higgs decay width h → φφ, we show how differential coupling fits can disentangle effects from non-Standard Model couplings and an invisible decay width, as present in many new physics scenarios, such as Higgs-portal dark matter. Including the so-called off-shell measurement that has been advocated as a sensitive determination of the Higgs width in the κ framework, we show explicitly that this method does not provide complementary sensitivity for scale-separated new physics m h m φ , which is favoured in beyond the Standard Model scenarios that relate astrophysics and collider phenomenology in the light of non-observation of new physics during run 1 of the LHC.

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“…[3] for an alternative method based on single Higgs production). The SM expectations for these processes, corresponding to λ 3 = λ 4 = m 2 H /(2v 2 ), being v 246 GeV the Higgs vacuum expectation value and m H its mass, are very low.…”

Section: Introductionmentioning

confidence: 99%

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

Mazzitelli

2017

J. High Energ. Phys.

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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.

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Probing the Higgs self coupling via single Higgs production at the LHC

Cited by 122 publications

References 49 publications

Large NLO corrections in t t ¯ W ± $$ t\overline{t}{W}^{\pm } $$ and

Large NLO corrections in t t ¯ W ± $$ t\overline{t}{W}^{\pm } $$ and

Higgs characterisation in the presence of theoretical uncertainties and invisible decays

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

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