Hyperfine splitting effects in string hadronization

TL;DR

This paper improves the Lund string hadronization model by incorporating hyperfine splitting effects, leading to better predictions of hadron yields in various high-energy collision experiments.

Contribution

It introduces a method to include hyperfine splitting effects in the hadronization process, enhancing the model's accuracy for different collision systems.

Findings

Improved description of hadron yields in e+e- collisions.

Enhanced prediction of phi cross section in neutral current DIS.

Results applicable to proton collision analyses.

Abstract

We revisit the recipe for hadron formation in the Lund string hadronization model. Given an incoming quark or quark-diquark pair, weights for hadron formation are updated to take hyperfine splitting effects arising from the mass difference between u, d-type and s-type quarks. We find that the procedure improves the description of hadron yields in $\mathrm{e}^+\mathrm{e}^-$ collisions and the $\phi$ cross section in neutral current DIS. We also show results for proton collisions, and discuss the future use of this study in the context of small system collectivity.