Effects of Colour Reconnection on Hadron Flavour Observables

Abstract

We present a comparison between two recently developed colour reconnection models, the new colour reconnection model in PYTHIA and the DIPSY rope hadronization model. Specifically we investigate ratios of identified hadron yields as a function of the final-state activity, as measured by the charged multiplicity. Since both models have a nontrivial dependence on the final-state activity, the above observables serve as excellent probes to test the effect of these models. Both models show a clear baryon enhancement with increasing multiplicity, while only the DIPSY rope model leads to a strangeness enhancement. Flow-like patterns, previously found to be connected to colour reconnection models, are investigated for the new models. Only PYTHIA shows a $p_{\perp }$-dependent enhancement of the $\Lambda /K$ ratio as the final-state activity increases, with the enhancement being largest in the mid-$p_{\perp }$ region.

Comments: 17 pages, 4 figures. Replacement: Updated to published version with supplementary material (comparison to LEP data and tunes) added