Diquark Higgs at LHC

Existence of color sextet diquark Higgs fields with TeV masses will indicate a fundamentally different direction for unification than conventional grand unified theories. There is a class of partial unification models based on the gauge group

SU(2)_L\times SU(2)_R\times SU(4)_c

that implement the seesaw mechanism for neutrino mass with seesaw scale around

10^{11}

GeV, where indeed such light fields appear naturally despite the high gauge symmetry breaking scale. They couple only to up-type quarks in this model. We discuss phenomenological constraints on these fields and show that they could be detected at LHC via their decay to either

tt

or single top + 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.

13.85.Rm
14.80.Cp
12.10.Dm
p p: interaction
top: pair production
top
jet: associated production
Higgs particle: diquark
color: sextet
channel cross section: angular distribution

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