Eur. Phys. J. C (2007) 52: 133-140
https://doi.org/10.1140/epjc/s10052-007-0352-1

Regular Article - Theoretical Physics

Non-perturbative QCD effects and the top mass at the Tevatron

¹ Theoretical Physics, MS106, Fermi National Accelerator Laboratory, P.O. Box 500, Batavia, IL, 60510-0500, USA
² Fachbereich C, Physik, Bergische Universität, Gaußstr. 20, 42097, Wuppertal, Germany

^* e-mail: skands@fnal.gov

Received: 16 March 2007
Revised: 22 May 2007
Published online: 25 July 2007

Abstract

We present a new, universally applicable toy model of colour reconnections in hadronic final states. The model is based on hadronising strings and has one free parameter. We next present an implementation of this model in the PYTHIA event generator and provide several parameter sets (‘tunes’), constrained by fits to Tevatron minimum-bias data. Finally, we consider the sensitivity of a simplified top mass analysis to these effects, in exclusive semi-leptonic top events at the Tevatron. A first attempt at isolating the genuine non-perturbative effects gives an estimate of order δm_top ∼ ±0.5 GeV from non-perturbative uncertainties, and a further δm_top ∼ ±1 GeV from shower effects.