Probing the weak boson sector in e+e-→W+W-

K. Hagiwara, R. D. Peccei, D. Zeppenfeld, K. Hikasa

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1002 Citations (Scopus)


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.

Original languageEnglish
Pages (from-to)253-307
Number of pages55
JournalNuclear Physics B
Issue numberC
Publication statusPublished - 1987


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