2019/05/08 by Alexandre Alves, Tathagata Ghosh, Farinaldo S. Queiroz
Physics and Astronomy · #Cosmology and Gravitation Theories #Dark Matter and Cosmic Phenomena #Higgs boson #Particle physics #Particle physics theoretical and experimental studies #Physics #hep-ex #hep-ph
paper · pdf · doi:10.1103/physrevd.100.036012
published as Phys. Rev. D 100, 036012 (2019) · 11 pages, 6 figures, 1 table
arxiv created 2019/05/08 · openalex created_date 2019/05/16 · openalex publication_date 2019/08/26 · arxiv updated 2019/09/04 · openalex updated_date 2026/08/06
If the Higgs boson decays to a pair of invisible particles, the number of di-Higgs events, where each Higgs decays into Standard Model (SM) particles, is reduced by a factor of two-third taking into account the current LHC bound on invisible decay width of the Higgs boson. We investigate the sensitivity of the upcoming high luminosity run of the LHC to di-Higgs production and subsequent decay to dark matter in the context of the singlet scalar extension of the SM augmented by a fermionic dark matter in the dark and bright channel \ensuremathγ\ensuremathγ+)ET. Once systematic uncertainties on background yields are considered, this dark and bright channel presents competitive limits than bb+)ET after a careful tuning of the kinematical cuts that raise the signal over background ratio. We further show that in a multivariate analysis, for an invisible branching fraction as low as \ensuremath∼10%, we obtain stronger bounds for the Higgs trilinear coupling from the \ensuremathγ\ensuremathγ+)ET channel compared to the bb\ensuremathγ\ensuremathγ final state. Finally, we demonstrate that the four channels \ensuremathγ\ensuremathγ+)ET, bb+)ET, bb\ensuremathγ\ensuremathγ, and bbbb complement each other in the search for di-Higgs production with non-SM trilinear couplings when an invisible decay mode is present.