Institute for Theoretical Particle Physics (TTP)


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preprints:1995:ttp95-48 [2016/03/17 11:03] (current)
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 +====== TTP95-48 Top Quark Polarization in Polarized <EM>e+e-</EM> Annihilation near Threshold ====== 
 +   <hidden TTP95-48  Top Quark Polarization in Polarized <EM>e+e-</EM> 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 
 + </hidden> 
 +|**R. Harlander, M. Jezabek, J.H. Kuehn and M. Peter**  |  
 +|** Z. Phys. C 73 477-494 1997  **  | 
 +| {{preprints:1995:ttp95-48.pdf|PDF}} {{|PostScript}} [[|arXiv]]   | 
 +| |