In the Standard Model, quark-lepton masses are also generated by their couplings with the Higgs particle as the W, Z vector bosons are. Their masses are different because the Yukawwa couplings are different. In principles, quark-leptons can have non-zero masses before the Higgs mechanism. Higgs may add only corrections to the final masses. Is there any way to determine that the quark-lepton masses are partially or totally generated by the Higgs mechanism?

  • $\begingroup$ See this question: physics.stackexchange.com/questions/409313/… $\endgroup$
    – gj255
    Jun 28, 2018 at 17:22
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    $\begingroup$ I think you are misinformed: current quark masses are entirely generated by Higgs Yukawa couplings, and no mass of such is possible "before the Higgs mechanism". The strong interactions are only responsible for the generation of the bulk of constituent quark masses, and of course, hadrons, a subtle subject best left to itself. Your statement on lepton masses is then indefensible. $\endgroup$ Jun 28, 2018 at 18:53
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    $\begingroup$ Higgs branching ratios or interparticle Higgs force could be measurably different from standard model expectations if such an extra mass contribution exists $\endgroup$ Jun 28, 2018 at 20:14
  • $\begingroup$ Thank you Mitchell Porter for the good answer. I guess that we do not have the available observation data yet to confirm whether the extra mass exist. Even if you do, I think we have so many Yukawa coupling parameters and extra masses, we can fit with any measured ratios. Am I right? $\endgroup$
    – user43442
    Jun 29, 2018 at 1:35
  • $\begingroup$ No. Again, the only current-quark masses in the fundamental Lagrangian can only be due to the Yukawa couplings, if left-chiral SU(2) gauge invariance is not to be violated, and, with it, renormalizability, etc. This is a pretty unique structure: the second job of the Higgs, and, in the view of many, including myself, an equally important one compared to the first. $\endgroup$ Jun 30, 2018 at 13:33


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