Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1994-01-20
Phys.Lett.B325:521-525,1994
Physics
High Energy Physics
High Energy Physics - Phenomenology
7 pages, 4 postscript figures
Scientific paper
10.1016/0370-2693(94)90050-7
We present exact tree level cross sections for the single top production process $e^- e^+ \rightarrow e^- \bar{\nu}_e t \bar{b} $ at LEP~200. The results reproduce roughly those obtained earlier by using the equivalent real photon approximation and we confirm the observation that detecting a top heavier than half the c.m.~energy is not feasible at LEP~200. The calculation has been performed by a new automatic Feynman amplitude generator MadGraph which produces HELAS code for the helicity amplitudes.
Hagiwara Kaoru
Stelzer Tim
Tanaka Masao
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