Gauge-invariant YFS exponentiation of (un)stable W+W- production at and beyond CERN LEP 2 energies

We present the theoretical basis and sample Monte Carlo data for the YFS exponentiated calculation of e+e-→W+W-→f1 bar f1'+bar f2f2' at and beyond CERN LEP 2 energies, where the left-handed parts of fi and fi' are the respective upper and lower components of an SU(2)L doublet, i=1,2. The problem of gauge invariance of the radiation from the unstable charged spin 1 W± is solved in an entirely physical manner. Our formulas are illustrated in a prototypical YFS Monte Carlo event generator YFSWW2, wherein both standard model and anomalous triple gauge boson couplings are allowed. copyright 1996 The American Physical Society