Chromo-and electrodynamics of heavy unstable particles

Abstract

Abstract In this lecture I 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−→ W+W−→ 4 jets and e+e− → tt → bW+bW−. 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.