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

By D. Wicke, Peter Z. Skands. 2007

197 citations recorded by the source corpus.

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 δmtop ∼ ±0.5 GeV from non-perturbative uncertainties, and a further δmtop ∼ ±1 GeV from shower effects.

Subfields: Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/61c9e932b1968d5348eec8ace60ee4ae71c68af0

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In Nuclear and High Energy Physics

Citations in the corpus

Multiplicity dependence of pion, kaon, proton and lambda production in p–Pb collisions at sNN=5.02 TeV (2013, background): “The fit results are shown for PYTHIA8 simulations performed both with and without the color reconnection mechanism [62,63].”
Tuning PYTHIA 8.1: the Monash 2013 tune (2014, background): “, to the effects of “colour reconnections” [95]), is the average charged-particle p⊥ as a function of the number of charged particles.”
Multiplicity dependence of the average transverse momentum in pp, p-Pb, and Pb-Pb collisions at the LHC (2013, background): “All experiments observed an increase of p T with N ch in the central rapidity region, a feature which could be reproduced in the PYTHIA event generator only if a mechanism of hadronization including color correlations (reconnections) is considered [30].”
On the characterisation of the underlying event (2009, background): “4, in the S0A tune [5, 38, 39] by P.”
Phenomenology of event shapes at hadron colliders (2010, methodology): “As in e+e− annihilation, there are nonperturbative effects due to hadronisation, i.e. related to the transition of partons to hadrons. seen here, which seem to be related to the conditions for secondary radiation from initial-state emissions in the S0A tune (we are grateful to Peter Skands for discu”
General-purpose event generators for LHC physics (2011, background): “A new generation of colour-reconnection toy models have therefore been developed specifically with soft-inclusive and underlying event physics in mind [119, 141, 142], and also the cluster-based [131] and Generalized-ArealLaw [134] models have been revisited in that context.”