Abstract
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. The chargino mass lies between 0.24 TeV and about 2.0 TeV, which can be tested based on the allowed decay channels. We also find {m}_{tilde{tau}1}gtrsim 500 GeV, and {m}_{tilde{e}},{m}_{tilde{mu}},{m}_{{tilde{v}}^{S,P}}gtrsim 1 TeV. We identify chargino-neutralino coannihilation processes in the mass region 0.24 TeV lesssim {m}_{{tilde{upchi}}_1^0}approx {m}_{{tilde{upchi}}_1^{pm }}lesssim 1.5 TeV, and also coannihilation processes involving stau, selectron, smuon and sneutrinos for masses around 1 TeV. In addition, A2 resonance solutions are found around 1 TeV, and H2 and H3 resonance solutions are also shown around 0.5 TeV and 1 TeV . Some of the A2 resonance solutions with tan β ≳ 20 may be tested by the A/H → τ+τ− LHC searches.. While the relic density constraint excludes the bino-like DM, it is still possible to realize higgsino, singlino and blino-like DM for various mass scales. We show that all these solutions will be tested in future direct detection experiments such as LUX-Zeplin and Xenon-nT.
Highlights
DM, it is still possible to realize higgsino, singlino and blino-like DM for various mass scales
We have discussed a class of SUSY models in which the MSSM gauge group is supplemented with a gauged U(1)B−L and a global U(1)R symmetry groups
The number of neutralinos is doubled in comparison with the MSSM and assuming the DM density is saturated by a LSP neutralino, the resulting model yields quite a rich phenomenology that we have explored in this paper
Summary
The renormalizable superpotential of the MSSM with R-parity conservation possesses three global symmetries, namely baryon number U(1)B, lepton number U(1)L and a R-symmetry U(1)R, where, for simplicity, we ignore the tiny non-perturbative violation of B and L by the SU(2)L instantons. Φ is responsible for generating a Majorana mass term for the right-handed neutrinos. The superfield S only carries a U(1)R charge, and develops a non-zero VEV after soft SUSY breaking proportional to the gravitino mass (m3/2). This can provide a resolution to the MSSM μ−problem [21,22,23], since the μ−term is effectively obtained as μ ≡ λμ vS. In addition to bino-dominated LSP, the variety of neutralinos can result in higgsinolike, singlino-like and blino-like LSPs, despite the universal gaugino mass term at the GUT scale
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