Chromo- and Electrodynamics of Heavy Unstable Particle

Abstract

In this talk I attempt to survey some selected physics issues on radiative interference phenomena in the production of heavy unstable particles. A special emphasis is placed on the reactions $e^{+}{e}^{-}\to W^{+}{W}^{-}\to 4$ jets and $e^{+}{e}^{-}\to t\bar{t}\to b{W}^{+}\bar{b}{W}^{-}$. A transparent recipe is given for quantifying the level of suppression of the interference effects in the inclusive production processes. The influence of the $W$ width on the Coulomb corrections to the threshold $W^{+}{W}^{-}$ production is briefly addressed.

Comments: 28 pages, LATEX, figures are not included (the hard copies are available from the Author)