Question: Professor Jeff Forshaw reckons that at a professional level, experimental data for particle physics is much more reliable than theorical calculations in terms of accuracy. Are you also of this opinion?
Yes, because the way that we do calculations in particle physics, called perturbation theory, is always an approximation: it is not possible to do an exact calculation using the methods that we use (and we don’t have any other methods!).
Also, of course, the data represent reality, whereas the calculations might not. We used to do calculations assuming neutrinos were massless, and that turned out to be wrong, so the calculations were using a flawed assumption.
Jeff’s a theorist. It’s very good of him to say this!
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