MSSM stands for the Minimal Supersymmetric Standard Model.

The MSSM is the minimal extension of the standard model of particle physics neccessary to accomodate supersymmetry. It includes all Standard Model particles plus superpartners to each that differ in spin by 1/2. In Addition, the Higgs sector needs to be extended, leading to a Type-I two-Higgs-doublet model.

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