Single- W production to test triple gauge boson couplings at LEP

Abstract

We present a study of single- W production ( e +e − → e − ν eW + ) as a new probe of the anomalous couplings at the LEP energy region. We introduce simple cuts to separate the single- W process from W-pair production and have performed cross-section calculations using 4-fermion generator “grc4f”. The cross-section of the single- W process is found to be large enough to detect at LEP experiments in the near future. In addition, a high sensitivity to the anomalous coupling of the WWγ vertex is expected since the amplitude of the WWγ diagram makes a dominant contribution in this process. We have found that the cross-section measurement of the single- W process in the LEP2 energy region can give complementary bounds on the anomalous couplings to those obtained from W-pair analysis.