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We show how effects of compositeness emerging in a Composite 2-Higgs DoubletModel can enter Standard Model (SM)-like Higgs pair production at the LargeHadron Collider in both resonant and non-resonant mode. Such effects can arisefrom modified trilinear Higgs self-couplings and top-Yukawa couplings as wellas from loops of new heavy quarks and additional quartic Higgs-fermioninteractions. In the resonant case, significant distortions of the Breit-Wigner shape of a new scalar state decaying into the two SM-like Higgs statesmay occur due to interference effects amongst not only the SM-like diagrams butalso those involving the new heavy quarks. In the non-resonant case, amodification of the underlying line-shape and a local maximum at twice a newheavy quark mass appear simultaneously. We quantify these effects by takinginto account the relevant theoretical and latest experimental bounds.

Composite 2-Higgs Doublet Model: Strong Effects on Higgs Pair Production