Probing Anomalous Triple Boson Vertices at Future $e^{+}{e}^{-}$ Colliders

Abstract

We explore the detection potential of the four lepton production processes $e^{+}{e}^{-}\to l^{+}\nu l^{\prime -}\overline{\nu }$ for anomalous contributions to the triple boson vertices at proposed future high energy colliders with center-of-mass energies of 500 GeV and 1 TeV. The predicted bounds are of the order of a few percent for the $CP$-even couplings ${\kappa }_V$ (V=$\gamma$,Z) at the higher energy; we show that these limits can be improved by as much as a factor of two through suitable phase space cuts. A polarized beam facility, with its ability to access helicity information, could provide constraints on the vertices significantly tighter than those achievable from an analysis of total cross-section alone. The asymmetries in experimental observables produced by an explicitly $CP$ violating triple vertex contribution are seen to be below the expected level of statistical precision of approximately $1.5\%$; asymmetries in the individual contributing helicity amplitudes might however be detectable.

Comments: 26 pages,Latex,4 tar-uuencoded figures