## An introduction to current algebra |

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6+soft Adler sum assume assumption axial current Bjorken Cabibbo angle Chapter charges Clebsch-Gordan coefficient commutation relations components conserved consider const contribution corrections corresponding coupling constant current algebra identities CVC theory decomposition deduce defined definition described divergences electromagnetic current electromagnetic interactions electroproduction equations exact low-energy theorem experiment experimental significance form factor four-momentum Fourier transform frame Fubini hadron hard meson hard pion idea invariant mass isospin isovector kinematic factor KSFR Lagrangian lepton pair lepton-lepton Lett List of applications Lorentz matrix element measure momentum limit multiplet neutron non-strangeness obtained octet parity PCAC Phys physical pion calculations pion pole pole approximations pole in q2 predictions proton reaction right-hand side S. L. Adler scattering amplitude soft pion theorem space-time strangeness-changing strong interaction sum rules T-matrix T-product techniques tion total cross-sections usual vanish vector currents weak and electromagnetic weak current weak decays weak interactions Weinberg zero