Gauge Invariant YFS Exponentiation of (Un)stable $Z$-Pair Production At and Beyond LEP2 Energies

Abstract

We present the theoretical basis and sample Monte Carlo data for the YFS exponentiated calculation of $e^{+}{e}^{-}\to ZZ\to f_1{\bar{f}}_1+{\bar{f}}_2{f}_2$ at and beyond LEP2 energies, where the left-handed part of $f_i$ is a component of an $S{U}_{2L}$ doublet, $i=1,2$. The calculation is performed for both SM couplings and for anomalous $ZZV$ triple gauge boson couplings in the conventions of Hagiwara et al.. Our formulas, which are gauge invariant, are illustrated in a proto-typical YFS Monte Carlo event generator YFSZZ.

Comments: 9 pages, 2 figures, 1 Latex file which includes the figures