Unpolarized Dihadron Fragmentation Functions in Nonlocal Chiral Quark Model

TL;DR

This paper calculates unpolarized dihadron fragmentation functions for pions and kaons using a nonlocal chiral quark model, compares results with the NJL-jet model, and contrasts them with Monte Carlo parametrizations at high energy scales.

Contribution

It introduces a calculation of dihadron fragmentation functions within the nonlocal chiral quark model and compares these results with the NJL-jet model and Monte Carlo data.

Findings

Significant differences between the NLChQM and NJL-jet model results.

Comparison of model predictions with JETSET parametrizations at high Q^2.

Evolution of fragmentation functions to Q^2=4 GeV^2.

Abstract

We have calculated the unpolarized dihadron fragmentation functions (uDiFFs) of pions and kaons using the nonlocal chiral-quark model (NLChQM) and evolved our results to the transferred momentum scale Q$^2$=4$\mathrm{GeV}^2$ by the QCD evolution equations. These uDiFFs have also been computed in the Nambu--Jona-Lasinio-jet (NJL-jet) model for the sake of comparison. We find that there is substantial difference between the results of these two models. Furthermore, the DiFFs of $u\to \pi^{+}\pi^{-}$ and $g\to \pi^{+}\pi^{-}$ at $Q^2=109\,\mathrm{GeV}^2$ in these two models are presented in comparison with the parametrizations fitted by the Monte Carlo event generator JETSET.