2016/02/29 by Marcin Badziak, Carlos E. M. Wagner
Physics and Astronomy · #Coupling (piping) #Gauge (firearms) #Gauge boson #Gauge theory #Gluon #Higgs boson #Higgs field #Higgs mechanism #Large Hadron Collider #Neutrino Physics Research #Particle physics #Particle physics theoretical and experimental studies #Physics #Quantum Chromodynamics and Particle Interactions #Quark #Standard Model (mathematical formulation) #Tevatron #Top quark #hep-ex #hep-ph
paper · pdf · doi:10.1007/jhep05(2016)123
19 pages, 4 figures; v2:comments and references added, matches published version
openalex publication_date 2016/05/01 · arxiv created 2016/11/17 · arxiv updated 2016/11/23 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/06
It is pointed out that in a wide class of models reminiscent of type-II Two-Higgs-Doublet Models (2HDM) the signal of the Higgs produced in association with a top-antitop quark pair (tth) and decaying into gauge bosons can be significantly larger than the Standard Model (SM) prediction without violating any experimental constraints. The crucial feature of these models is enhanced (suppressed) Higgs coupling to top (bottom) quarks and existence of light colored particles that give negative contribution to the effective Higgs coupling to gluons resulting in the gluon fusion rates in the gauge boson decay channels close to SM predictions. We demonstrate this mechanism in NMSSM with light stops and show that tth signal in the W W decay channel can be two times larger than the SM prediction, as suggested by the excesses observed by ATLAS and CMS, provided that the Higgs-singlet superpotential coupling λ ≳ 0.8 and the MSSM-like Higgs boson masses are in the range of 160 to 300 GeV.