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arXiv · 0807.4936

Supersymmetry with a Chargino NLSP and Gravitino LSP

Graham D. Kribs·Adam Martin·Tuhin S. Roy
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Abstract

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(μ) and tan(beta) is small. We briefly comment on the search strategies for this signal at the LHC.

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Graham D. Kribs, Adam Martin, Tuhin S. Roy. 2008-07-30. Supersymmetry with a Chargino NLSP and Gravitino LSP. https://doi.org/10.1088/1126-6708%2F2009%2F01%2F023

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