Light Higgsinos in Pure Gravity Mediation
arXiv:1412.3403 · doi:10.1103/PhysRevD.91.055008
Abstract
Pure gravity mediation (PGM), with two free parameters, is a minimalistic approach to supergravity models, yet is capable of incorporating radiative electroweak symmetry breaking, a Higgs mass in agreement with the experimental measurement, without violating any phenomenological constraints. The model may also contain a viable dark matter candidate in the form of a wino. Here, we extend the minimal model by allowing the -term to be a free parameter (equivalent to allowing the two Higgs soft masses, and , to differ from other scalar masses) which are set by the gravitino mass. In particular, we examine the region of parameter space where in which case, the Higgsino becomes the lightest supersymmetric particle (LSP) and a dark matter candidate. We also consider a generalization of PGM which incorporates a Peccei-Quinn symmetry which determines the -term dynamically. In this case, we show that the dark matter may either be in the form of an axion and/or a neutralino, and that the LSP may be either a wino, bino, or Higgsino.
24 pages, 13 Figures
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