Constraints on the trilinear Higgs coupling from vector boson fusion and associated Higgs production at the LHC

Bizon, Wojciech; Gorbahn, Martin; Haisch, Ulrich; Zanderighi, Giulia

doi:10.1007/jhep07(2017)083

Cited by 71 publications

(97 citation statements)

References 119 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…[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.

107

View full text Add to dashboard Cite

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.

show abstract

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.

107

View full text Add to dashboard Cite

show abstract

“…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

View full text Add to dashboard Cite

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.

show abstract

“…For results and discussion (with supporting calculations) characterizing various NLO corrections in the SMEFT see refs. [13][14][15][16][17][18][19][20][21][22][23][24][25][26].…”

Section: Jhep03(2017)060mentioning

confidence: 99%

The Z decay width in the SMEFT: y t and λ corrections at one loop

Hartmann

Shepherd

Trott

2017

J. High Energ. Phys.

View full text Add to dashboard Cite

We calculate one loop y t and λ dependent corrections toΓ Z ,R 0 f and the partial Z widths due to dimension six operators in the Standard Model Effective Field Theory (SMEFT), including finite terms. We assume CP symmetry and a U(3) 5 symmetry in the UV matching onto the dimension six operators, dominantly broken by the Standard Model Yukawa matrices. Corrections to these observables are predicted using the input parameters {α ew ,M Z ,Ĝ F ,m t ,m h } extracted with one loop corrections in the same limit. We show that at one loop the number of SMEFT parameters contributing to the precise LEPI pseudoobservables exceeds the number of measurements. As a result the SMEFT parameters contributing to LEP data are formally unbounded when the size of loop corrections are reached until other data is considered in a global analysis. The size of these loop effects is generically a correction of order ∼ % to leading effects in the SMEFT, but we find multiple large numerical coefficients in our calculation at this order. We use a MS scheme, modified for the SMEFT, for renormalization. Some subtleties involving novel evanescent scheme dependence present in this result are explained.

show abstract

Constraints on the trilinear Higgs coupling from vector boson fusion and associated Higgs production at the LHC

Cited by 71 publications

References 119 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

The Z decay width in the SMEFT: y t and λ corrections at one loop

Contact Info

Product

Resources

About