Phenomenology of nonuniversal gaugino masses in supersymmetric grand unified theories

Abstract

Grand unified theories can lead to nonuniversal boundary conditions for the gaugino masses at the unification scale. We consider the implications of such nonuniversal boundary conditions for the composition of the lightest neutralino as well as for the upper bound on its mass in the simplest supersymmetric grand unified theory based on the SU(5) gauge group. We derive sum rules for neutralino and chargino masses in different representations of SU(5) which lead to different nonuniversal boundary conditions for the gaugino masses at the unification scale. We also consider the phenomenological implications of the nonuniversal gaugino masses arising from a grand unified theory in the context of large hadron collider. In particular we investigate the detection of heavy neutral Higgs bosons H⁰, A⁰ from H⁰, A⁰→χ˜₂⁰χ˜₂⁰→4l and study the possibilities of detecting the neutral Higgs bosons in cascade decays, including the decays χ˜₂⁰→h⁰(H⁰,A⁰)χ˜₁⁰→bb̅χ˜₁⁰.