Unpolarized Dihadron Fragmentation Functions in Nonlocal Chiral Quark Model

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.

Comments: 13 pages, 9 Figs, this article supersedes arXiv:1304.0525