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

Abstract

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.

5 pages + 4 uunecoded postscript figures

References in corpus (4)

• Observation of Top Quark Production in Pbar-P Collisions
• Observation of the Top Quark
• Automatic Generation of Tree Level Helicity Amplitudes
• Additional Soft Jets in $\mathrm{t}\bar{\mathrm{t}}$ Production at the Tevatron $\pp$ Collider

Cited by in corpus (10)

• Measurement of the Top Quark Mass with the Collider Detector at Fermilab
• Matrix Element Corrections to Parton Shower Simulations of Heavy Quark Decay
• ttbar production cross section in ppbar collisions at sqrt{s} = 1.8 TeV
• Final state QCD corrections to off-shell single top production in hadron collisions
• The process `e+ e- --> H t t-bar' and its backgrounds at future electron-positron colliders
• Gluon Radiation in $t\bar{t}$ Production and Decay at the LHC
• Jet Algorithms and Top Quark Mass Measurement
• Soft Gluon Radiation in Top Events: Effect of Hadronic $W$ Decays
• Improving the Measurement of the Top Quark Mass
• Top-antitop pair production via $b$-quark initiated processes at the Large Hadron Collider