Quark Masses and Chiral Symmetry

摘要: The low energy properties of the standard model are governed by Lagrangian SU(3)colourx U(1)e.m.. If masses three light quarks as well electromagnetic interaction neglected, this is invariant under a group chiral transformations. Since ground state not symmetric group, spectrum contains massless Goldstone bosons which dominate structure theory. As quark turned on, pick up mass, but poles generated them still behvior Green’s functions at small momenta. I show how to systematically determine theory considering simultaneous expansion in powers momenta and mu, md, ms. applications method, discuss some predictions for form factors, ππ-scattering η-decay review information on mass ratios mu: md: ms follows from pseudoscalar mesons.