Effects of Colour Reconnection on Hadron Flavour Observables

TL;DR

This paper compares two colour reconnection models, PYTHIA and DIPSY, analyzing their effects on hadron flavour observables, revealing differences in strangeness enhancement and flow-like patterns as functions of final-state activity.

Contribution

It introduces a comparative analysis of two recent colour reconnection models and their impact on hadron yield ratios and flow-like patterns in high-energy collisions.

Findings

Both models show baryon enhancement with increasing multiplicity.

Only DIPSY shows strangeness enhancement.

PYTHIA exhibits a $p_\perp$-dependent $\\Lambda/K$ ratio increase.

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.