A detailed analysis of W pair production in e+e- annihilation at LEP-II energies is presented by using helicity amplitudes for the process e+e-→W+W- with arbitrary WWγ and WWZ couplings. Expressing the complete angular distribution of W decay products in terms of these helicity amplitudes, we perform a systematic search for the most sensitive angular distributions or correlations for anomalous couplings. As a result precise tests of the gauge-theory cancellations between different diagrams are suggested. Angular distributions sensitive to W+W- rescattering effects and/or CP-violating vector boson couplings are studied as well. Complete helicity amplitudes for the process e+e- → W+W- → (q1q2g)(q3q4g) with arbitrary quark masses and finite W width are presented in a form convenient for their direct numerical evaluation. Amplitudes for the processes e+e- → ZZ and Zγ are also included.
ASJC Scopus subject areas
- Nuclear and High Energy Physics