CP Violating Anomalous Couplings at a 500 GeV e+ e- Linear Collider

We study the sensitivity of a 500 GeV $e^+e^-$ Linear Collider to $CP$ violating anomalous couplings. We find that with 50~fb$^{-1}$, and taking only one non-zero coupling at a time, the process $e^+e^-\to W^+ W^-$ can be used to place the 95% confidence level bounds $|\tildeκ_γ|\leq0.1$, $|\tildeκ_Z|\leq 0.1$ and $|g_4^Z|\leq 0.1$ from CP even observables. By studying certain distributions in the process $e^+e^-\to μ^+μ^-ν\barν$ one of the bounds can be improved to $|g_4^Z| \leq 0.06$. This process also allows the construction of a CP odd observable which can be used to place bounds on CP violating new physics. At the 95% confidence level we find $|\tildeκ_γ|\leq 0.3$, $|\tildeκ_Z|\leq 0.2$ and a much weaker bound for $|g_4^Z|$.

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