Why would finding superpartner particles not prove that string theory is correct?

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Finding superpartner particles would not prove that string theory is correct because supersymmetry—the mathematical property that predicts these particles—is not exclusive to string theory.1

More-conventional point-particle theories have also successfully incorporated supersymmetry into their mathematical structures. Therefore, while the discovery of superpartners would confirm an essential element of string theory and provide significant circumstantial evidence that the approach is on the right track, it would not serve as definitive proof of the theory itself.1