> A good hypothesis results in the same experiment as its negative: "There are more supersymmetric particles at higher energies" is the same hypothesis as "Ther

> A good hypothesis results in the same experiment as its negative: "There are more supersymmetric particles at higher energies" is the same hypothesis as "There are not more supersymmetric particles at higher energies" because you test both hypotheses in the same way. Actually, no, they are not the same. You are excluding the middle, as it is necessary for an experiment to disprove the null hypothesis before any conclusion can be made. Just because you don't prove your hypothesis doesn't mean you prove its negation. Typically, an experiment will find no result at all.