A Higgs-Like Scalar With Mixed-Parity and Standard-Model-Like Couplings Could be Further Evidence for Underlying Massless SU(5) Unification

Abstract

The bound-state S-Matrix of QUD (SU(5) gauge theory with massless left-handed 5 + 15 + 40 + 45* fermions) might underly the success of the Standard Model. The dynamical role of the QUD top quark leads to two Higgs-like scalar resonances, the eta_6 - which reproduces Standard Model top events, and the eta_3 - which could have a mass ~ 125 GeV. The participation of the weak interaction in the dynamics implies the resonances are not parity eigenstates and so should have pseudoscalar and scalar electroweak couplings. Also, a tree-unitarity condition could hold - in part because of the closeness of the electroweak physical amplitudes to perturbation theory, and - in part because of the intimate relation with regge behavior. This would imply that the combined physical couplings of the two resonances are comparable to those of the Standard Model Higgs boson. Unlike the isolated Standard Model, the underlying unification of QUD implies there will be no LHC "nightmare scenario" and that, instead, a broad, extensive, experimental program should, eventually, be implemented.