2011/04/30 by B. Ananthanarayan, Sumit K. Garg, Monalisa Patra +1
Engineering · Physics and Astronomy · #Computer science #Particle Accelerators and Free-Electron Lasers #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #hep-ex #hep-ph
paper · pdf · doi:10.1103/physrevd.85.034006
published as Phys. Rev. D 85, 034006 (2012) · 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
openalex publication_date 2012/02/06 · arxiv created 2012/02/07 · arxiv updated 2015/03/18 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
We revisit the process e+e^\ensuremath-\ensuremath→\ensuremathγZ at the ILC with transverse beam polarization in the presence of anomalous CP-violating \ensuremathγZZ coupling \ensuremathλ1 and \ensuremathγ\ensuremathγZ coupling \ensuremathλ2. We point out that if the final-state spins are resolved, then it becomes possible to fingerprint the anomalous coupling Re\ensuremathλ1. 90% confidence level limit on Re\ensuremathλ1 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^\ensuremath-2 when the helicity of Z is used and 10^\ensuremath-3 when the helicity of \ensuremathγ 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.