Proton decay has not been observed and has been constrained to be extremely rare in ordinary low temperature situations, if it happens at all (the Standard Model says it doesn't happen at all, because there are no lighter decay products that would not violate conservation of baryon number). But, we know that all of physical constants of the Standard Model change with energy scale, as a physical consequence of renormalization. So, could it be possible the protons decay at higher energies but not at lower ones, either in the Standard Model or with New Physics? Following this train of thought further, however, it occurred to me that at some energy scale that is high enough, talking about a proton ceases to be meaningful, because you get quark-gluon plasma instead. So, my question is, what do the physical constants of the Standard Model (which might be relevant to proton decay) look like at the energy scale just below the threshold of quark-gluon plasma, since this is the highest energy scale at which something which could be meaningfully called proton decay could occur? And, with these values, is proton decay prohibited in the Standard Model or under popular BSM theories? Also, have we reproduced experimentally the energy scales at which protons cease to exist in favor of quark-gluon plasmas experimentally? Or, can this question be answered solely based upon theoretical calculations?