TeV window to grand unification: The Higgs boson’s light color triplet partner

The color-triplet partner of the Higgs doublet, called a <a:math xmlns:a="http://www.w3.org/1998/Math/MathML" display="inline"><a:mi>T</a:mi></a:math>-particle, is a universal feature of grand unification. It was shown some time ago that this particle can be accessible for direct production in collider experiments. In this paper, we point out that the <c:math xmlns:c="http://www.w3.org/1998/Math/MathML" display="inline"><c:mi>T</c:mi></c:math>-particle represents a simultaneous low-energy probe of baryon number violation as well as of the origin of the neutrino mass, linking the mediation of proton decay with oscillations of the neutron into a sterile neutrino. We point out a triple correlation between its collider signatures, proton decay measurements, and the searches for the magnetic resonance disappearance of free neutrons in cold neutron experiments. In this way, the <e:math xmlns:e="http://www.w3.org/1998/Math/MathML" display="inline"><e:mi>T</e:mi></e:math>-particle can provide a diversity of correlated experimental windows into grand unification.