Probing gaugino coannihilation with displaced vertex searches

Bino-like dark matter in supersymmetric theories tends to suffer from over-production. This problem can be evaded if there is another gaugino which has a mass close to the bino mass so that it enhances the annihilation rate of bino dark matter through coannihilation. We study such possibilities in high-scale supersymmetric models, and show that searches for long-lived particles with displaced vertices can test the bino-gaugino coannihilation scenario in the forthcoming LHC experiments.Comment: 8 pages, 4 figures; the 11th International Workshop Dark Side of the Universe 2015, 14-18 December 2015, Kyoto, Japan; v2: references adde