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DIRAC FIELD THEORY AND THE LEPTONIC CURRENT
PURELY LEPTONIC PROCESSES
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algebra amplitudes analogous approximation arising axial vector axial vector current baryon beta decay C-parity Cabibbo hypothesis calculate charge combination conjugate conserved consider contribution coupling constant CP-invariance CP-violation cross sections decay rate deduce defined derived diagrams Dirac equation divergent electromagnetic corrections electromagnetic interactions electron experimental Feynman field operators field theory follows form factors gauge invariant given gives hadronic hadronic current Hamiltonian hermitian hypercharge hyperon implies integral isospin kaon kinematic Lagrangian leptonic leptonic current Lett linear Lorentz transformations mass meson momenta muon decay neutral currents neutral kaon neutrino neutron non-zero nucleon observed obtain octet parity violating particle PCAC Phys physical pion Plainly Poincare predictions proton pseudoscalar quantities quantum numbers quark renormalization representation s-wave satisfy scalar scattering soft pion spin spinors strong interactions sum rule symmetry vector current W-boson wave function weak interactions weak processes zero