# Differences

This shows you the differences between two versions of the page.

 — preprints:1995:ttp95-48 [2016/03/17 11:03] (current) Line 1: Line 1: + ====== TTP95-48 Top Quark Polarization in Polarized e+e- Annihilation near Threshold ====== + + + e+e- Annihilation near Threshold > Top quark polarization in $e^+e^-$ annihilation into $t\bar t$ + 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 $\langle n \ell \rangle$ + 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 $\langle n \ell \rangle$ 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 + + |**R. Harlander, M. Jezabek, J.H. Kuehn and M. Peter**  | + |** Z. Phys. C 73 477-494 1997  **  | + | {{preprints:1995:ttp95-48.pdf|PDF}} {{preprints:1995:ttp95-48.ps|PostScript}} [[http://arxiv.org/abs/hep-ph/9604328|arXiv]]   | + | |