Probing Anomalous Top-Quark Couplings Induced by Dim.6 Operators at Photon Colliders

Details Probing Anomalous Top-Quark Couplings Induced by Dim.6 Operators at Photon Colliders Probing Anomalous Top-Quark Couplings Induced by Dim.6 Operators at Photon Colliders

2003-10-14

arxiv.org/abs/hep-ph/0310159v3

Nucl.Phys. B689 (2004) 108-126

Physics

High Energy Physics

High Energy Physics - Phenomenology

23 pages, Latex2e, Two eps-figures. Final version which is to appear in Nucl.Phys.B

Scientific paper

10.1016/j.nuclphysb.2004.04.006

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.

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