Abstract
A search is presented for the production of a pair of Higgs bosons, where one decays into two photons and the other one into a bottom quark–antiquark pair. The analysis is performed using proton–proton collision data at s=13TeV recorded in 2016 by the CMS detector at the LHC, corresponding to an integrated luminosity of 35.9fb−1. The results are in agreement with standard model (SM) predictions. In a search for resonant production, upper limits are set on the cross section for new spin-0 or spin-2 particles. For the SM-like nonresonant production hypothesis, the data exclude a product of cross section and branching fraction larger than 2.0fb at 95% confidence level (CL), corresponding to about 24 times the SM prediction. Values of the effective Higgs boson self-coupling κλ are constrained to be within the range −11<κλ<17 at 95% CL, assuming all other Higgs boson couplings are at their SM value. The constraints on κλ are the most restrictive to date.
Highlights
The discovery of a particle with a mass of about 125 GeV, with properties compatible with those expected for the Higgs (H) boson of the standard model (SM) [1,2,3], has stimulated interest in the detailed exploration and understanding of the origin of the Brout–Englert–Higgs (BEH)mechanism [4, 5]
The total background model is obtained as a sum of the nγ + jets background continuum probability densities (PDs) and single-Higgs boson production PDs, the latter being normalized to their SM production cross sections
The data exclude a cross section of 0.23 to 4.2 fb depending on mX and the spin hypothesis
Summary
The discovery of a particle with a mass of about 125 GeV, with properties compatible with those expected for the Higgs (H) boson of the standard model (SM) [1,2,3], has stimulated interest in the detailed exploration and understanding of the origin of the Brout–Englert–Higgs (BEH). Models with warped extra dimensions (WED) [9] postulate the existence of compactified extra spatial dimensions They predict new resonances decaying to a Higgs boson pair, including spin-0 radions R [10] and spin-2 Kaluza–Klein gravitons (KK graviton) [11]. Models with an extended Higgs sector predict a spin-0 resonance that decays to a pair of SM Higgs bosons, if sufficiently massive Examples of such models are the singlet extension of the SM [13], the two-Higgs-doublet models [14] (in particular, the minimal supersymmetric model [15]), and the Georgi–Machacek model [16].
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