Coannihilation scenarios and particle spectroscopy inSU(4)c×SU(2)L×SU(2)R

We identify a variety of coannihilation scenarios in a supersymmetric $SU(4{)}_c\times SU(2{)}_L\times SU(2{)}_R$ model with discrete left-right symmetry. Nonuniversal gaugino masses, compatible with the gauge symmetry, play an essential role in realizing gluino and bino-wino coannihilation regions that are consistent with the WMAP dark matter constraints. We also explore regions of the parameter space in which the little hierarchy problem is partially resolved. We present several phenomenologically interesting benchmark points and the associated sparticle and Higgs mass spectra.