Optimal Beam Polarizations for New-Physics Search through gamma gamma -> t tbar -> lX/bX

Bohdan Grzadkowski (Warsaw U.); Jose Wudka (UC Riverside); Kazumasa Ohkuma (Fukui U. Tech.); Zenro Hioki (U. Tokushima)

Optimal Beam Polarizations for New-Physics Search through gamma gamma -> t tbar -> lX/bX

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arxiv hep-ph/0508183 v4 pith:ADHGC7ZO submitted 2005-08-17 hep-ph hep-ex

Bohdan Grzadkowski (Warsaw U.) , Zenro Hioki (U. Tokushima) , Kazumasa Ohkuma (Fukui U. Tech.) , Jose Wudka (UC Riverside) This is my paper · ORCID

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keywords gammabeampolarizationscouplingsdeterminationoptimaltbaranalysis

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We perform an optimal-observable analysis of the final charged-lepton/b-quark momentum distributions in gamma+gamma -> t+tbar -> lX/bX for various beam polarizations in order to study possible anomalous t-tbar-gamma, tbW and gamma-gamma-H couplings, which could be generated by SU(2)xU(1) gauge-invariant dimension-6 effective operators. We find optimal beam polarizations that will minimize the uncertainty in determination of those non-standard couplings. We also compare e+ebar and gamma+gamma colliders from the viewpoint of the anomalous-top-quark-coupling determination.

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