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We study a class of models in which the Higgs pair production is enhanced athadron colliders by an extra neutral scalar. The scalar particle is produced bythe gluon fusion via a loop of new colored particles, and decays into di-Higgsthrough its mixing with the Standard Model Higgs. Such a colored particle canbe the top/bottom partner, such as in the dilaton model, or a colored scalarwhich can be triplet, sextet, octet, etc., called leptoquark, diquark, coloron,etc., respectively. We examine the experimental constraints from the latestLarge Hadron Collider (LHC) data, and discuss the future prospects of the LHCand the Future Circular Collider up to 100TeV. We also point out that the2.4$\sigma$ excess in the $b\bar b\gamma\gamma$ final state reported by theATLAS experiment can be interpreted as the resonance of the neutral scalar at300GeV.

Di-higgs enhancement by neutral scalar as probe of new colored sector