Nonperturbative partonic quasidistributions of the pion from chiral quark models

TL;DR

This paper computes nonperturbative quark quasidistributions of the pion using chiral quark models, showing good agreement with lattice QCD data and providing explicit analytic expressions for the dependence on pion momentum.

Contribution

It introduces analytic expressions for pion quasidistributions within chiral quark models and compares them favorably to lattice QCD results, advancing nonperturbative understanding.

Findings

Model results match lattice data for quasidistributions.

Quark distribution amplitude agrees with lattice data after QCD evolution.

Explicit dependence on pion momentum is analytically accessible.

Abstract

We evaluate nonperturbatively the quark quasidistribution amplitude and the valence quark quasidistribution function of the pion in the framework of chiral quark models, namely the Nambu--Jona-Lasinio model and the Spectral Quark Model. We arrive at simple analytic expressions, where the nonperturbative dependence on the longitudinal momentum of the pion can be explicitly assessed. The model results for the quark quasidistribution amplitude of the pion compare favorably to the data obtained from the Euclidean lattice simulations. The quark distribution amplitude, arising in the limit of infinite longitudinal momentum of the pion, agrees, after suitable QCD evolution, to the recent data extracted from Euclidean lattices, as well as to the old data from transverse lattice simulations.