On Gluon Radiation in $t \bar t$ Production and Decay

Details On Gluon Radiation in $t \bar t$ Production and Decay On Gluon Radiation in $t \bar t$ Production and Decay

1995-05-11

arxiv.org/abs/hep-ph/9505282v1

Phys.Lett. B354 (1995) 442-446

Physics

High Energy Physics

High Energy Physics - Phenomenology

5 pages + 4 uunecoded postscript figures

Scientific paper

10.1016/0370-2693(95)00651-Z

Understanding the pattern of gluon radiation in $t \bar t$ production processes is important for making an accurate determination of the top mass from the measurement of its decay products. In a recent paper we showed that the exact matrix element and parton shower (HERWIG) calculations gave very different results for the distribution of gluon jets in $t \bar t$ production at the Tevatron $p \bar p$ collider. By repeating the calculation for the simpler $e^+e^- \to b \bar b W^+W^-g$ process, we reveal even more dramatic differences between the two approaches. We conclude that there are significant differences in gluon radiation between HERWIG and the matrix element calculation in regions of phase space where one would expect agreement.

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