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Adding minimal supersymmetric dark matter model with a singlet-triplet Higgs portal.

Prathik Reddy Boyella requested to merge pboyella/MadGraphModels:main into main

This model includes the first and second neutralinos (PdgIds 9000005, 9000006) and a chargino (PdgId 9000007) with different production and decay rates compared to their usual counterparts. The lightest neutralino is a stable dark matter candidate, and the chargino can be long lived, leaving a displaced vertex signature.

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