Sparticle spectroscopy and dark matter in a U(1)B−L extension of MSSM
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 mτ ∼1≳ 500 GeV, and me ∼,mμ ∼,mv∼S ,P≳ 1 TeV. We identify chargino-neutralino coannihilation processes in the mass region 0.24 TeV ≲mχ∼10≈mχ∼1±≲ 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.
- Publication:
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Journal of High Energy Physics
- Pub Date:
- January 2021
- DOI:
- 10.1007/JHEP01(2021)161
- arXiv:
- arXiv:2008.01568
- Bibcode:
- 2021JHEP...01..161A
- Keywords:
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- Supersymmetry Phenomenology;
- High Energy Physics - Phenomenology
- E-Print:
- 23 pages,4 figures