Measuring Chiral Parameters in the Strongly Interacting W system at a Linear Collider

Abstract

In the absence of a Higgs particle vector boson scattering amplitudes are generally described by an electroweak chiral Lagrangian below the resonance region. For a Linear Collider with CMS energy $\sqrt{s}=1.6 TeV$ and an integrated luminosity of $200 fb^{-1}$ we estimate the sensitivity on the chiral parameters $\alpha_4$ and $\alpha_5$. We consider the processes $e^+e^-\to W^+W^-\bar\nu\nu$ and $e^+e^- \to ZZ\bar\nu\nu$, performing a complete calculation which includes all relevant Feynman diagrams at tree level, without relying on the Equivalence Theorem or the Effective $W$ Approximation. The dominant backgrounds and $W/Z$ misidentification probabilities are accounted for.