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

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Abstract

We present a complete calculation of the matrix elements for the processes \(q \bar q, gg \to b W^+ \bar b W^- g\) and \(qg \to b W^+ \bar b W^- q\) which are relevant for the study of events with an additional jet in \(t \bar t\) production at the Tevatron \(p \bar p \) collider. Our calculation includes (i) the contributions from gluons emitted during the top production and decay stages and the interference between these, and (ii) the complete set of Feynman diagrams corresponding to both resonant and non-resonant top 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 mass measurements are briefly discussed.

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Parton Distributions of the Proton

, , (2010)

To obtain improved parton densities of the proton, we present a new global analysis of deep inelastic and related data including, in particular, the recent measurements of \(F_2\) at HERA, of the asymmetry of the rapidity distributions of \(W^\pm\) production at the FNAL \(pp\) collider and of the asymmetry in Drell-Yan production in \(pp\) and \(pn\) collisions. We also incorporate data to determine the flavour dependence of the quark sea distributions. We find that the behaviour of the partons at small \(x\) is consistent with the precocious onset of BFKL leading \(\log(1/x)\) dynamics. We discuss the ambiguities remaining in the gluon distribution. We present improved predictions for \(W\) boson (and \(t\) quark) production at the FNAL \(\pp\) collider.

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Soft Gluon Radiation in Hadronic \(t\bar t\) Production

W. Stirling, J. Ohnemus, V. A. Khoze (1993)

We investigate soft gluon radiation in hadronic \(t\bar t\) production. By taking the top quark decay properly into account, we are able to study the interplay of radiation both before and after the decay of the top quarks. The production--decay and decay--decay radiative interferences depend sensitively on the relative size of the gluon energy and the decay width. Radiation patterns for various production mechanisms are compared.