Multi-photon production in the Type-I 2HDM

Abstract

This paper presents a study of a possible contribution to a Higgs boson signal in the hh → γγγγ channel due to H → hh decays, in the framework of the CP-conserving 2-Higgs Doublet Model Type-I (2HDM-I), where the heavier of the two CP-even Higgs bosons defined herein, H, is the SM-like Higgs state observed with a mass of 125 GeV at the Large Hadron Collider (LHC). We perform a broad scan of the 2HDM-I parameter space, in presence of both up-to-date theoretical and experimental constraints, in order to extract the interesting regions yielding such a signal. Then, after validating our numerical framework against public experimental analyses carried out at the LHC, we proceed to assess its scope in constraining and/or extracting the gg → H → hh → γγγγ signal in presence of a sophisticated Monte Carlo (MC) simulation. We find that, over a substantial region of the 2HDM-I parameter space presently un-accessible, the LHC will be able to establish such a potential signature in the next 2-3 years.

Electroweak production of multiple (pseudo)scalars in the 2HDM

“…This theoretical scenario has been shown to yield spectacular signals involving light neutral Higgs states, with a mass smaller than that of H obs , that are potentially accessible at the LHC, see Refs. [17,18,19,20]. Here, we assess the complementary portion of the Type-I 2HDM parameter space, wherein the lighter of the two scalar Higgs states has a mass of 125 GeV, along the lines of [21], which considered a similar setup but concentrated exclusively on charged Higgs boson signals.…”