Constraining a CP-violating WWV coupling from the W^+W^- threshold cross section at LEP2

Abstract

The most general form of the $WWZ$ and $WW\gamma$ interaction contains a $CP$-violating term which has the same threshold behaviour as the Standard Model $\text{ee}\to \text{ww}$ cross section. We calculate the cross section as a function of the corresponding anomalous coupling, and estimate the bounds which can be obtained from a measurement of the threshold cross section at LEP2. We show how the effect of the coupling is most pronounced in the angular distributions of the final-state fermions.

Comments: 7 pages, LaTeX file, 5 ps figures