LHC phenomenology of composite 2-Higgs doublet models

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De Curtis S., Moretti S., Kei Yagyu K. Y., Yildirim E.

EUROPEAN PHYSICAL JOURNAL C, vol.77, no.8, 2017 (SCI-Expanded) identifier identifier


We investigate the phenomenology of Composite 2-Higgs doublet models (C2HDMs) of variousYukawa types based on the global symmetry breaking SO(6) -> SO(4) x SO(2). The kinetic part and the Yukawa Lagrangian are constructed in terms of the pseudo Nambu-Goldstone Boson (pNGB) matrix and a 6-plet of fermions under SO(6). The scalar potential is assumed to be the same as that of the Elementary 2-Higgs doublet model (E2HDM) with a softly broken discrete Z(2) symmetry. We then discuss the phenomenological differences between the E2HDM and C2HDM by focusing on the deviations from standard model (SM) couplings of the discovered Higgs state (h) as well as on the production cross sections and branching ratios (BRs) at the large Hadron collider (LHC) of extra Higgs bosons. We find that, even if the same deviation in the hV V (V = W, Z) coupling is assumed in the two scenarios, there appear significant differences between the E2HDM and C2HDM from the structure of the Yukawa couplings, so that production and decay features of extra Higgs bosons can be used to distinguish between the two scenarios.