I think the prediction you may be referring to is supersymmetry, which was apparently empirically disproved by the LHC, or at least the supersymmetric extension

I think the prediction you may be referring to is supersymmetry, which was apparently empirically disproved by the LHC, or at least the supersymmetric extension to the standard model was disproved. https://www.sciencenews.org/article/supersymmetrys-absence-lhc-puzzles-physicists https://www.sciencenews.org/article/supersymmetrys-absence-l...