Top-quark mass effects in double and triple Higgs production in gluon-gluon fusion at NLO
By Fabio Maltoni, E. Vryonidou, M. Zaro. 2014
167 citations recorded by the source corpus.
A bstractThe observation of double and triple scalar boson production at hadron colliders could provide key information on the Higgs self couplings and the potential. As for single Higgs production the largest rates for multiple Higgs production come from gluon gluon fusion processes mediated by a top-quark loop. However, at variance with single Higgs production, top-quark mass and width effects from the loops cannot be neglected. Computations including the exact top-quark mass dependence are only available at the leading order, and currently predictions at higher orders are obtained by means of approximations based on the Higgs-gluon effective field theory (HEFT). In this work we present a reweighting technique that, starting from events obtained via the MC@NLO method in the HEFT, allows to exactly include the top-quark mass and width effects coming from one- and two-loop amplitudes. We describe our approach and apply it to double Higgs production at NLO in QCD, computing the needed one-loop amplitudes and using approximations for the unknown two-loop ones. The results are compared to other approaches used in the literature, arguing that they provide more accurate predictions for distributions and for total rates as well. As a novel application of our procedure we present predictions at NLO in QCD for triple Higgs production at hadron colliders.
Subfields: Nuclear and High Energy Physics
View Paper: https://www.semanticscholar.org/paper/9b75334a67db661f7d49f27369db6e7d3740f40d
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In Nuclear and High Energy Physics
- Gudrun Heinrich
- Cms Collaboration
- Atlas Collaboration
- M. Grazzini
- Stefan Kallweit
- Fabio Maltoni
- G. Panico
- A. Wulzer
Citations in the corpus
- Collider physics at the precision frontier (2020, methodology): “[292], using the approximation FTapprox, where the virtual amplitude is calculated in the HTL, while keeping the exact dependence on the top quark mass is used for the real emission contributions.”
- Automated event generation for loop-induced processes (2015, unknown): “4% [59] †c.”
- Physics at a 100 TeV pp collider: Higgs and EW symmetry breaking studies (2016, methodology): “Higgs pair production in the gluon-fusion channel is simulated at LO thorugh MadGraph5_aMC@NLO [134, 211] by using the recently developed functionalities for loop-induced processes [221].”
- Probing the Higgs self coupling via single Higgs production at the LHC (2016, background): “Finally, the perspectives of determining the quartic Higgs self coupling λ4 via measurements in triple Higgs production seems quite bleak at the LHC[36, 37], due to the smallness of the corresponding cross section [14].”
- Full top quark mass dependence in Higgs boson pair production at NLO (2016, methodology): “The “FT ′ approx” result [55] in addition uses partial NLO results for the virtual part, i.”
- Mass effects in the Higgs-gluon coupling: boosted vs. off-shell production (2014, unknown): “This defines a correction factor [94–96]”
- Higgs pair production at next-to-next-to-leading logarithmic accuracy at the LHC (2015, methodology): “[36] via a reweighting technique that allows to exactly include the one- and two-loop amplitudes.”
- Higgs boson pair production in the D = 6 extension of the SM (2014, background): “The choice is conservative, and justified at present by the fact that the low-energy theorem in the SM is estimated to possess O(10%) uncertainty [12, 19].”
- Higgs boson pair production at NNLO with top quark mass effects (2018, methodology): “[4, 22] an approximation for Higgs boson pair production at NLO, labelled “FTapprox”, was introduced, in which the real radiation matrix elements contain the full”