# What is the way to work out the running of lepton masses?

If we assume the GUT unification energy is some value E, (say $$10^{16}GeV$$). Can we work out the running of the particle masses for example the electon, muon and tau at various energies? And will they all have the same mass at the Unification energy?

• I think their masses will all go to zero as the Higgs field loses its expectation value. – G. Smith May 25 '19 at 3:16
• There is no "the GUT unification energy" - there is a lot of different theories for how a GUT is supposed to work, and it's not clear why you think that the behaviour of the particle masses would be independent of the details of the theory. – ACuriousMind May 25 '19 at 9:39
• @ACuriousMind Well it might just be a formula that depends only on the rest mass and the Unification Energy. Such as $M_e exp(-E/E_U)$ as a made up example. Lots of times you get simple formulae independent of the details. For example, I wondered if the formula was like an exponential, or like a power law, or like a polynomial law. – zooby May 25 '19 at 14:10