Hello! I have one more year in undergraduate and I would like to go for a grad school in USA and do theoretical physics. I am a bit confused about particle physics. From what I saw most of the theoretical models today aim to extend the standard model and yet most of them are proved to be wrong at LHC (at least at the available energy). My main question is how are certain physicists considered to be better than others when most of the theories that are not disproved, can't be proved either (in string theory for example). So as long as you can't test 2 theories, how can you say one is better than the other? So what it takes to be a good theoretical physicist, when your theories can't be tested? (and I include here most of the main topic nowadays: supersymmetry, string theory, dark matter, dark energy etc.). Thank you!