Light Higgsinos in pure gravity mediation

Jason L. Evans, Masahiro Ibe, Keith A. Olive, Tsutomu T. Yanagida

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18 Scopus citations

Abstract

Pure gravity mediation, with two free parameters, is a minimalistic approach to supergravity models, yet it 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 μ term to be a free parameter equivalent to allowing the two Higgs soft masses, m1 and m2, to differ from other scalar masses, which are set by the gravitino mass. In particular, we examine the region of parameter space where μ m3/2, in which case the Higgsino becomes the lightest supersymmetric particle and a dark matter candidate. We also consider a generalization of pure gravity mediation that incorporates a Peccei-Quinn symmetry which determines the μ 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 lightest supersymmetric particle may be either a wino, bino, or Higgsino.

Original languageEnglish (US)
Article number055008
JournalPhysical Review D - Particles, Fields, Gravitation and Cosmology
Volume91
Issue number5
DOIs
StatePublished - Mar 9 2015

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