Gauge Theory of Weak Interactions

angle angular antiparticle antisymmetric baryon calculation centre-of-mass frame charge components contributions corresponding cos² coupling constant cross section denotes diagrams Dirac doublets eigenstates electromagnetic electron emitted energy equation example Exercise experimental factor Fermi fermion Feynman gauge fields gauge invariance gauge theory gauge transformation Greiner hadronic helicity Hence Higgs field intermediate bosons isospin Lagrangian left-handed leptons Lorentz massless matrix element mesons momentum muon muon decay neutral current neutrino neutron nuclear nucleus obtain operator parity particles Phys physics pion Pmax polarization propagator proton quantum numbers quarks relation representation rest frame result scalar scattering sin² Solution spin spinors ẞ decay symmetry tensor transition vacuum expectation value vertex wave function weak current weak interaction Weinberg angle yields Z boson αβ Αμ μ μ μν