Analysis of leptonic charged weak interactions

Motivated by the desire to test the limits of the standard model via the Lorentz structure of charged wead interactions we perform an extended and systematic analysis of charge-changing leptonic vertices. Based on a helicity projection form of the effective hamiltonian, the analysis yields improved limits in noncanonical couplings from recent, high-precision measurements in muon decay. We also give limits on possible, charge-neutral exchanges with intrinsic electron and muon number. (orig.)