Institut für Theoretische Teilchenphysik
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Institute for Theoretical Particle Physics (TTP)
Institute for Theoretical Particle Physics (TTP)
Institute for Theoretical Particle Physics (TTP)
Preprints
1997
TTP97-27 Final-State Interactions in e+e- -> ttbar -> b l+ nu bbar W- Near Top Quark Threshold
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 +====== TTP97-27 Final-State Interactions in e+e- -> ttbar -> b l+ nu bbar W- Near Top Quark Threshold ====== 
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 +   <hidden TTP97-27  Final-State Interactions in e+e- -> ttbar -> b l+ nu bbar W- Near Top Quark Threshold > We calculate final-state interaction corrections to the energy-angular distribution 
 + of l+ in semi-leptonic top quark decay, where the parent top quark is produced via 
 + e+e- -> t\bar{t} near threshold. These are the corrections due to gluon 
 + exchange between t and \bar{b} (\bar{t} and b) and between b and \bar{b}. 
 + Combining with previously known other corrections, we explicitly write down the 
 + l+ energy-angular distribution including the full O(alpha_s)=O(beta) corrections 
 + near t\bar{t} threshold. Numerical analyses of the final-state interaction 
 + corrections are given. We find that they deform the l+ distribution typically at the 
 + 10% level. We also find that all qualitative features of the numerical results can be 
 + understood from intuitive pictures. The mechanisms of various effects of the 
 + final-state interactions are elucidated. Finally we define an observable which is 
 + proper to the decay process of the top quark (dependent only on d\Gamma_{t -> b 
 + l+ \nu}/ dE_l d\Omega_l of a free polarized top quark) near t\bar{t} threshold. 
 + Such a quantity will be useful in extracting the decay property of the top quark using 
 + the highly polarized top quark samples. 
 +  
 + </hidden> 
 +|**M. Peter and Y. Sumino**  |  
 +|** Phys. Rev. D 57 6912 1998  **  | 
 +| {{preprints:1997:ttp97-27.pdf|PDF}} {{preprints:1997:ttp97-27.ps|PostScript}} [[http://arxiv.org/abs/hep-ph/9708223|arXiv]]   | 
 +| |