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| — | preprints:1997:ttp97-23 [2016/03/15 20:39] (current) – created - external edit 127.0.0.1 |
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| | ====== TTP97-23 Final-State Interactions in e^+e^- \to t\bar t \to bl^+\nu\bar bW^- Near Top Quark Threshold ====== |
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| | <hidden TTP97-23 Final-State Interactions in e^+e^- \to t\bar t \to bl^+\nu\bar bW^- 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^- \to 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 full O(\alpha_s)=O(\beta) corrections near |
| | threshold. Numerical analyses of the final-state interaction |
| | corrections are presented. We find that they deform the l^+ |
| | distribution typically at 10% level. Also we elucidate mechanisms of |
| | the various effects of the final-state interactions. We find that all |
| | qualitative features of the numerical results can be understood from |
| | intuitive pictures. The natures that \bar{b} is emitted preferrably in |
| | the parent \bar{t}'s spin direction and that there is attractive force |
| | between \bar{b} and \bar{t} generate: shift of |p_t|-distribution, |
| | forward-backward asymmetry of t, modification of the top-quark |
| | polarization vector, and energy-angle-correlated deformation of l^+ |
| | distributions. |
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| | </hidden> |
| | |**M. Peter and Y. Sumino** | |
| | | {{preprints:1997:ttp97-23.pdf|PDF}} {{preprints:1997:ttp97-23.ps|PostScript}} | |
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