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We consider the impact of colored scalars that can couple directly to matterfields on the recently measured h to gamma gamma excess. Among all possiblecandidates only scalar states transforming as (8, 2,1/2) and (6,3,1/3) underthe Standard Model gauge group can individually accommodate the excess andremain in agreement with all available data. Current experimental constraintsrequire such colored states to have an order one coupling to the Standard ModelHiggs and a mass below 300 GeV. We use the best fit values to predict thecorrelated effect in h to Z gamma and di-Higgs production. We furthermorediscuss where and how these states appear in extensions of the Standard Modelwith primary focus on scenarios of matter unification. We revisit two simpleSU(5) setups to show that these two full-fledged models not only accommodate alight color octet state but correlate its mass with observable partial protondecay lifetimes.

Higgs Uncovering Light Scalar Remnants of High Scale Matter Unification