Isolating CP-violating γZZ coupling in e+e- \to γZ with transverse beam polarizations

Abstract

We revisit the process $e^{+}{e}^{-}\to \gamma Z$ at the ILC with transverse beam polarization in the presence of anomalous CP-violating $\gamma ZZ$ coupling ${\lambda }_1$ and $\gamma \gamma Z$ coupling ${\lambda }_2$. We point out that if the final-state spins are resolved, then it becomes possible to fingerprint the anomalous coupling {\rm Re}${\lambda }_1$.90% confidence level limit on {\rm Re}${\lambda }_1$ achievable at ILC with center-of-mass energy of 500 GeV or 800 GeV with realistic initial beam polarization and integrated luminosity is of the order of few times of $10^{-2}$ when the helicity of $Z$ is used and $10^{-3}$ when the helicity of $\gamma$ is used. The resulting corrections at quadratic order to the cross section and its influence on these limits are also evaluated and are shown to be small. The benefits of such polarization programmes at the ILC are compared and contrasted for the process at hand. We also discuss possible methods by which one can isolate events with a definite helicity for one of the final-state particles.

13 pages, 9 figures, using RevTex; v2 is a significantly revised version of v1, and corresponds to the version that has been published in Physical Review D

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Cited by in corpus (13)

• On polarization parameters of spin-$1$ particles and anomalous couplings in $e^{+}{e}^{-}\to ZZ/Z\gamma$
• Anomalous triple gauge boson couplings in $ZZ$ production at the LHC and the role of $Z$ boson polarizations
• On the choice of beam polarization in $e^{+}{e}^{-}\to ZZ/Z\gamma$ and anomalous triple gauge-boson couplings
• $ZZ\gamma$ and $Z\gamma \gamma$ anomalous couplings in $\gamma p$ collision at the LHC
• Contributions to $ZZ{V}^{\ast }$ ($V=\gamma ,Z,Z^{\prime }$) couplings from $CP$ violating flavor changing couplings
• New Physics in $e^{+}{e}^{-}\to Z\gamma$ at the ILC with polarized beams: Explorations beyond conventional anomalous triple gauge boson coupling
• Model-independent study on the anomalous $ZZ\gamma$ and $Z\gamma \gamma$ couplings at the future muon collider
• Probing the anomalous triple gauge boson couplings in $e^{+}{e}^{-}\to W^{+}{W}^{-}$ using $W$ polarizations with polarized beams
• Pinning down the gauge boson couplings in $WW\gamma$ production using forward proton tagging
• Non-diagonal contributions to $Z\gamma V^{\ast }$ vertex, polarizations and bounds on $Z\overline{t}q$ couplings
• Inclusive spin-momentum analysis and new physics at a polarized electron-positron collider
• Search for Neutral Triple Gauge Couplings with $ZZ$ Production at Future Electron Positron Colliders
• Probing Neutral Triple Gauge Couplings at e- p colliders