arXiv:hep-ph/0310159·v3·High Energy Physics — Phenomenology
Probing Anomalous Top-Quark Couplings Induced by Dim.6 Operators at Photon Colliders
Bohdan Grzadkowski (Warsaw U. & CERN)🇵🇱 · Zenro Hioki (U. Tokushima)🇯🇵 · Kazumasa Ohkuma (Fukui U. Technology)🇯🇵 · Jose Wudka (UC Riverside)🇺🇸
Abstract
Possible anomalous top-quark couplings induced by SU(2) x U(1) gauge-invariant dimension-6 effective operators were studied in the process of t t-bar productions and decays at polarized gamma gamma colliders. Two CP-violating asymmetries, a linear-polarization asymmetry and a circular-polarization asymmetry, were computed including both non-standard [t t-bar gamma] and [gamma gamma H] couplings. An optimal-observable analysis for the process gamma gamma --> t t-bar --> l^{+-} ... was performed in order to estimate the precision for determination of all relevant non-standard couplings, including the anomalous tbW coupling.
Comments: 23 pages, Latex2e, Two eps-figures. Final version which is to appear in Nucl.Phys.B