Chiral Lagrangians and the transition amplitude for radiative muon   capture
  The transition operator for the radiative capture of mesons mu minus by protons is constructed starting from a chiral Lagrangian of the N-pi-rho-a_1-omega system obtained within the approach of hidden local symmetries. The transition operator is gauge invariant and satisfies exactly the CVC and PCAC equations. 
J. Smejkal and E. Truhlik (Institute of Nuclear Physics, Rez n.   Prague, Czech Republic) and F.C. Khanna (Theoretical Physi...