Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2011-04-19
Phys. Rev. D 85, 034006 (2012)
Physics
High Energy Physics
High Energy Physics - Phenomenology
13 pages, 9 figures, using RevTex; v2 is a significantly revised version of v1, and corresponds to the version that has been p
Scientific paper
10.1103/PhysRevD.85.034006
We revisit the process $e^+e^- \to \gamma Z$ at the ILC with transverse beam polarization in the presence of anomalous CP-violating $\gamma Z Z$ 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.
Ananthanarayan Balasubramanian
Garg Sumit K.
Patra Monalisa
Rindani Saurabh D.
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