Polarization in Top Quark Pair Production near Threshold

Abstract

The polarization dependent momentum distributions of top quarks and their decay products are calculated for $t\bar{t}$ production at future $e^{+}{e}^{-}$ colliders with polarized beams. The Green function formalism is applied to this reaction near energy 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 at large momentum transfers and Richardson ansatz at intermediate and small ones. It is demonstrated that for the longitudinally polarized electron beam an optimally polarized sample of top quarks can be produced.

11 pages, LaTex (uses epsf.sty, 3 ps-figures appended as extra uuencoded file). The complete paper, including figures, is also available via anonymous ftp at ftp://ttpux2.physik.uni-karlsruhe.de/ttp94-28/ttp94-28.ps, or via www at http://ttpux2.physik.uni-karlsruhe.de/preprints.html

References in corpus (3)

• V-a Tests Through Leptons from Polarised Top Quarks
• Distributions of leptons in decays of polarised heavy quarks
• Momentum Distributions in $t\bar{t}$

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