W. J. Stirling

Gluon radiation intt¯production at the Fermilab Tevatronpp¯collider

We present a complete calculation of the matrix elements for the processes {ital q{bar q}},{ital gg}{r_arrow}{ital bW}{sup +}{ital {bar b}W}{sup {minus}}{ital g} and {ital qg}{r_arrow}{ital bW}{sup +}{ital {bar b}W}{sup {minus}}{ital q} which are relevant for the study of events with an additional jet in {ital t{bar t}} production at the Fermilab Tevatron {ital p{bar p}} collider. Our calculation includes (i) the contributions from gluons emitted during the top quark production and decay stages and the interference between these, and (ii) the complete set of Feynman diagrams corresponding to both resonant and nonresonant top quark production. We study the distribution in phase space of the additional parton jet and make comparisons with previous studies based on the soft-gluon approximation and with results from parton-shower Monte Carlo simulations. The implications for top quark mass measurements are briefly discussed.

Gluon Radiation in t\bar{t} Production at the Tevatron p\bar{p} Collider

We present a complete calculation of the matrix elements for the processes {ital q{bar q}},{ital gg}{r_arrow}{ital bW}{sup +}{ital {bar b}W}{sup {minus}}{ital g} and {ital qg}{r_arrow}{ital bW}{sup +}{ital {bar b}W}{sup {minus}}{ital q} which are relevant for the study of events with an additional jet in {ital t{bar t}} production at the Fermilab Tevatron {ital p{bar p}} collider. Our calculation includes (i) the contributions from gluons emitted during the top quark production and decay stages and the interference between these, and (ii) the complete set of Feynman diagrams corresponding to both resonant and nonresonant top quark production. We study the distribution in phase space of the additional parton jet and make comparisons with previous studies based on the soft-gluon approximation and with results from parton-shower Monte Carlo simulations. The implications for top quark mass measurements are briefly discussed.

Additional Soft Jets in

A large fraction of top quark events in

{\rm t\bar{t}}

pp

Production at the Tevatron

collisions at

\pp

1.8 TeV

Collider

will contain additional soft hadronic jets from gluon bremsstrahlung off the quarks and gluons in the hard processes

Longitudinal structure function at small x: The effect of next-to-leading-order QCD corrections and heavy-flavor thresholds.

qq, gg to tt to bb ww

Gluon radiation in tt-bar production at the Fermilab Tevatron pp-bar collider.

. These extra jets can cause complications when attempting to reconstruct

Gluon Radiation and Top Width Effects

m_t