Quantum Theory: Radiation and high energy physics

7-meson amplitudes angular momentum annihilation atom calculation canonical charge commutation relations commutation rules components Compton effect conjugate consider corresponding covariant cross section d³k d³p d³x defined denotes density diagram Dirac equation divergences eigenvalues electromagnetic field electron line example external field factor field equations fluctuations given gives H₁ Heisenberg Heisenberg picture infinite integral introduce invariance isotopic spin Lagrangian Lorentz transformations mass matrix element meson meson field meson-nucleon scattering momenta negative energy nonrelativistic nuclear forces nucleon operators P₁ pair particle perturbation phase shifts photon line Phys pion polarisation positive potential processes production properties quantum theory radiation field radiative corrections relativistic renormalised representation result s-wave satisfy scalar Schrödinger equation self-energy solution space tion vacuum vacuum expectation value vector vertex wave function zero ΔΕ μ² μν