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

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.

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

References in corpus (3)

• Decoupling of Anomalous Top-Quark-Decay Vertices in Angular Distribution of Secondary Particles
• Study of CP Property of the Higgs at a Photon Collider using $\gamma \gamma \to t\bar{t}\to lX$
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• Effective Field Theory Beyond the Standard Model
• New Physics effects in the flavor-changing neutral couplings of the Top quark
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• New Prospects for Higgs Compositeness in h -> Z gamma
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