William J. Marciano

Exotic Decays of the Muon and Heavy Leptons in Gauge Theories

Abstract We have studied the decay l1 → l2 + γ for arbitrary like charged spin 1 2 leptons in a manner which is applicable to a large class of models. Our computations assume that this process is induced by one loop diagrams. When the leading effect is cancelled by a leptonic G.I.M. mechanism, we find an extremely large enhancement of O(MW4/ML4) in Λ(μ−→e−+e+e−)/Λ(μ−→e−+γ) if the intermediate lepton is charged.

Dimensional regularization of infrared divergences

Abstract An analysis of the application of dimensional regularization to infrared divergences in lowest order radiative corrections is presented. The main emphasis of the paper is to show explicitly how dimensional regularization can lead in some cases of considerable interest to very simple and elegant evaluations of infrared divergent contributions and their associated finite parts, and to pinpoint the mathematical reason for the equivalence with the traditional method of regularization.

Decays of intermediate vector bosons, radiative corrections and QCD jets

We investigate decay properties of the intermediate vector bosons W± and Z0. QED and QCD radiative corrections to leptonic and hadronic decay modes are calculated. Implications of the results for decay widths, branching ratios, determination of the number of neutrino species, e-μ-τ universality and properties of hadronic jets produced in W± and Z0 decays are examined.

Parity violating asymmetries in polarized electron scattering

We discuss parity violating asymmetries between the scattering of right and left-handed electrons on a variety of targets. Implications for gauge theories from recent SLAC results on deep-inelastic electron-deuterium and electron-proton scattering are examined. A derivation of the asymmetry for electron-electron scattering is given, its advantages are pointed out, and the feasibility of such a measurement is discussed. Other proposed or contemplated asymmetry experiments are reviewed and the necessity of including the Collins-Wilczek-Zee hadronic axial isoscalar current contribution in asymmetry predictions is noted.

W-production viaZ-decay

AbstractWe calculate the decay rate for the processZ Boson→W Boson+fermion+antifermion. The result is applied to compute the decay rates for

On infrared problems in muon decay

Z \to W^ + + l + \bar v_l

Status of Muon-Number Conservation and Comments on Parity Violation in Atoms

,l=e, μ or τ andZ→W++anything in the Weinberg-Salam model. At the present experimental value of sin2θw=0.23 the branching ratios for the above processes are