I thought that string theory started a particle off with having the planck mass, and then via quantum fluctuations most of that mass is cancelled out, leaving the remainder as the total mass.
Also - and sorry for being another pest in this thread - but how exactly does the Standard Model of particle physics determine *why* particles have the mass they do. I was under the impression that the SM just takes these arbitrary values as a given and basically ignores the underlying reason, or am I wrong