Supersymmetry with a Chargino NLSP and Gravitino LSP

Details Supersymmetry with a Chargino NLSP and Gravitino LSP Supersymmetry with a Chargino NLSP and Gravitino LSP

2008-07-30

arxiv.org/abs/0807.4936v1

JHEP 0901:023,2009

Physics

High Energy Physics

High Energy Physics - Phenomenology

27 pages and 16 figures

Scientific paper

10.1088/1126-6708/2009/01/023

We demonstrate that the lightest chargino can be lighter than the lightest neutralino in supersymmetric models with Dirac gaugino masses as well as within a curious parameter region of the MSSM. Given also a light gravitino, such as from low scale supersymmetry breaking, this mass hierarchy leads to an unusual signal where every superpartner cascades down to a chargino that decays into an on-shell W and a gravitino, possibly with a macroscopic chargino track. We clearly identify the region of parameters where this signal can occur. We find it is generic in the context of the R-symmetric supersymmetric standard model, whereas it essentially only occurs in the MSSM when sign(M1) is not equal to sign(M2) = sign(\mu) and tan(beta) is small. We briefly comment on the search strategies for this signal at the LHC.

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