CP-violating Anomalous $WW\gamma$ Couplings in e^+e^- Collisions

TL;DR

This paper assesses the potential of future linear colliders to detect CP-violating $WW\gamma$ couplings via the process $e^+e^- o uar{ u}\gamma$, providing projected sensitivity limits at various energies and luminosities.

Contribution

It presents new sensitivity estimates for CP-violating $WW\gamma$ couplings at future linear colliders, improving upon previous LEP2 bounds.

Findings

Projected 95% CL limits: | ilde{\kappa}_\gamma| < 0.18 and | ilde{\lambda}_\gamma| < 0.069 at 500 GeV.

Sensitivity at future colliders significantly surpasses LEP2 bounds.

Limits depend on machine energy and luminosity.

Abstract

We investigate the sensitivity of future linear collider experiments to CP violating $WW\gamma$ couplings in the process $e^{+}e^{-} \to \nu\bar{\nu}\gamma$. We consider several sets of machine parameters: centre of mass energies $\sqrt{s}$ = 350, 500 and 800 GeV and operating at different luminosities. From an analysis of the differential cross-section the following 95% C.L. limits $|\tilde{\kappa}_{\gamma}| < 0.18$, $|\tilde{\lambda}_{\gamma}| < 0.069$ are estimated to be obtained at a future 500 GeV LC with an integrated luminosity of $125 \fb^{-1}$, a great improvement as compared to the LEP2 reach, where a senstitivity of order 2 for both couplings is found.