Sparticle spectroscopy and dark matter in a U(1)_<em>B-L</em>extension of MSSM

We consider a class of SUSY models in which the MSSM gauge group is supplemented with a gauged U(1)_B-L symmetry and a global U(1)_R symmetry. This extension introduces only electrically neutral states, and the new SUSY partners effectively double the number of states in the neutralino sector that now includes a blino (from B - L) and singlino from a gauge singlet superfield. If the DM density is saturated by a LSP neutralino, the model yields quite a rich phenomenology depending on the DM composition. The LSP relic density constraint provides a lower bound on the stop and gluino masses of about 3 TeV and 4 TeV respectively, which is testable in the near future collider experiments such as HL-LHC.