Weinberg, Implications of Dynamical Symmetry Breaking, Phys.
Higgs, Broken Symmetries and the Masses of Gauge Bosons, Phys. Brout, Broken Symmetry and the Mass of Gauge Vector Mesons, Phys. As a novel application of our procedure we present predictions at NLO in QCD for triple Higgs production at hadron colliders.į. 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. 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.
In this work we present a reweighting technique that, starting from events obtained via the method in the HEFT, allows to exactly include the top-quark mass and width effects coming from one- and two-loop amplitudes. 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). However, at variance with single Higgs production, top-quark mass and width effects from the loops cannot be neglected. As for single Higgs production the largest rates for multiple Higgs production come from gluon gluon fusion processes mediated by a top-quark loop. The observation of double and triple scalar boson production at hadron colliders could provide key information on the Higgs self couplings and the potential.
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