A Sneutrino NLSP in the $ν$CMSSM

Details A Sneutrino NLSP in the $ν$CMSSM A Sneutrino NLSP in the $ν$CMSSM

2009-02-15

arxiv.org/abs/0902.2510v3

Phys.Rev.D79:055018,2009

Physics

High Energy Physics

High Energy Physics - Phenomenology

16 pages, 5 figures

Scientific paper

10.1103/PhysRevD.79.055018

We extend the constrained minimal supersymmetric model (CMSSM) by adding a right-handed neutrino superfield ($\nu$CMSSM) which decouples close to the GUT scale. We study the effects of a right-handed neutrino on the low energy spectrum and focus on the predictions for dark matter properties. We pay particular attention to the realization of the light (left-handed) sneutrino which can be the next-to-lightest supersymmetric particle (NLSP) with either the neutralino or gravitino as the lightest supersymmetric particle (LSP). Notably, for the case of a neutralino LSP with a sneutrino NLSP, there are new `sneutrino coannihilation regions' which yield the desired thermal neutralino relic density determined by WMAP.

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