Diquark Higgs bosons at the CERN LHC

Abstract

Existence of color sextet diquark Higgs fields with TeV masses will indicate a fundamentally different direction for unification than conventional grand unified theories. One class of models where they appear naturally is the supersymmetric $SU(2{)}_{L}\ifmmode\times\else\texttimes\fi{}SU(2{)}_{R}\ifmmode\times\else\texttimes\fi{}SU(4{)}_{c}$ model embedding the seesaw mechanism for neutrino mass with seesaw scale around ${10}^{11}\text{ }\text{ }\mathrm{GeV}$. The diquark Higgs fields in this model couple only to up-type quarks. We discuss phenomenological constraints on these fields and show that they could be detected at LHC via their decay to either $tt$ or single $\mathrm{\text{top}}+\mathrm{\text{jet}}$. We also find that existing Tevatron data gives a lower bound on its mass somewhere in the 400--500 GeV, for reasonable values of its coupling.