2014/03/31 by Julien Baglio, Otto Eberhardt, Ulrich Nierste +1 · 2 citations
Physics and Astronomy · #Boson #Cosmology and Gravitation Theories #Dark Matter and Cosmic Phenomena #Electroweak interaction #Gauge (firearms) #Gauge boson #Higgs boson #Higgs field #Higgs mechanism #Large Hadron Collider #Nuclear physics #Particle physics #Particle physics theoretical and experimental studies #Physics #Physics beyond the Standard Model #Standard Model (mathematical formulation) #Technicolor #Two-Higgs-doublet model #hep-ex #hep-ph
paper · pdf · doi:10.1103/physrevd.90.015008
published as Phys. Rev. D 90, 015008 (2014)
openalex publication_date 2014/07/09 · arxiv created 2014/07/11 · arxiv updated 2014/07/16 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
The search for additional Higgs particles and the exact measurements of Higgs (self-)couplings is a major goal of future collider experiments. In this paper we investigate the possible sizes of new physics signals in these searches in the context of the CP-conserving two-Higgs-doublet model (2HDM) of type II. Using current constraints from flavor, electroweak precision, and Higgs signal strength data, we determine the allowed sizes of the triple-Higgs couplings and the branching fractions of the heavy Higgs bosons into lighter Higgs bosons. Identifying the observed Higgs resonance with the light CP-even 2HDM Higgs boson h, we find that the hhh coupling cannot exceed its Standard Model (SM) value, but can be reduced by a factor of 0.56 at the 2\ensuremathσ level. The branching fractions of the heavy neutral Higgs bosons H and A into two-fermion or two-vector-boson final states can be reduced by factors of 0.4 and 0.01, respectively, if decays into a lighter Higgs boson are possible and if the mass of the decaying Higgs is below the tt threshold. To facilitate future studies of collider signatures in 2HDM scenarios with large triple-Higgs couplings or decay modes of the heavy Higgs bosons not covered by the SM Higgs searches we provide a set of benchmark points which exhibit these features and agree with all current constraints. We also discuss the effect of the heavy Higgs bosons on the gg\ensuremath→hh cross section at a 14 TeV LHC for some of these benchmarks. For mH below the hh threshold we see a reduction of the SM gg\ensuremath→hh cross section due to destructive interference, but for mH above the hh threshold current constraints allow enhancement factors above 50. An enhancement factor of 6 is still possible in scenarios in which the heavy Higgs particles would not be discovered by standard searches after 300 fb^\ensuremath-1 of data.