Top quark polarization in polarized e+e− annihilation near threshold |
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Authors: | R Harlander M Jeżabek J H Kühn M Peter |
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Institution: | 1. Institut für Theoretische Teilchenphysik, Universit?t Karlsruhe, D-76128, Karlsruhe, Germany 2. Institute of Nuclear Physics, ul. Kawiory 29a, PL-30055, Cracow, Poland
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Abstract: | Top quark polarization in e+et - annihilation into tt? is calculated for linearly polarized beams. The Green function formalism is applied to this reaction near threshold. The Lippmann—Schwinger equations for the S-wave and P-wave Green functions are solved numerically for the QCD chromostatic potential given by the two-loop formula for large momentum transfer and Richardson’s ansatz for intermediate and small momenta. S- P— wave interference contributes to all components of the top quark polarization vector. Rescattering of the decay products is considered. The mean values 〈nl〉 of the charged lepton four-momentum projections on appropriately chosen directions n in semileptonic top decays are proposed as experimentally observable quantities sensitive to top quark polarization. The results for 〈nl〉 are obtained including S- P— wave interference and rescattering of the decay products. It is demonstrated that for the longitudinally polarized electron beam a highly polarized sample of top quarks can be produced. |
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