Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2011-04-12
JHEP 1106:006,2011
Physics
High Energy Physics
High Energy Physics - Phenomenology
24 pages, revised for publication in JHEP
Scientific paper
10.1007/JHEP06(2011)006
We discuss a new variant of the E6 inspired supersymmetric standard model (E6SSM) in which the two inert singlinos are exactly massless and the dark matter candidate has a dominant bino component. A successful relic density is achieved via a novel mechanism in which the bino scatters inelastically into heavier inert Higgsinos during the time of thermal freeze-out. The two massless inert singlinos contribute to the effective number of neutrino species at the time of Big Bang Nucleosynthesis, where the precise contribution depends on the mass of the Z' which keeps them in equilibrium. For example for mZ' > 1300 GeV we find Neff \approx 3.2, where the smallness of the additional contribution is due to entropy dilution. We study a few benchmark points in the constrained E6SSM with massless inert singlinos to illustrate this new scenario.
Hall Jonathan Peter
King Stephen F.
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