🚀 go-pugleaf

s5169180@deimos.ucc.umass.edu (S5169180) asks:
> [Can we] predict masses of quarks or leptons purely in theoretical way,
> instead of experiments?

No, there is no accepted theory of the fermion masses.  On the other hand
the gauge boson masses (W,Z) are predictable (M_W = gv/2), and their
detection at CERN with the predicted masses was a great triumph for the
Standard Model.  Of the Standard Model's 19 free parameters, most are
related to masses:
  9 quark and lepton masses (top mass still unknown)
  4 CKM matrix parameters (3 angles, 1 phase), related to quark masses
  2 Higgs parameters: vev is known, Higgs mass is unknown
  3 gauge couplings
  1 Theta_QCD = 0 but nobody's sure why

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A loose affiliation of millionaires and    |  (brahm@coil.caltech.edu)
  billionaires and Baby ...                |---------------------------
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