Application of chiral quarks to high-energy processes and lattice QCD

TL;DR

This paper reviews chiral quark models for soft matrix elements involving pions and photons, comparing model predictions with data and lattice results, emphasizing the importance of QCD evolution from low to high scales.

Contribution

It provides a comprehensive review of chiral quark models applied to high-energy processes and lattice QCD, highlighting their predictive success and the role of QCD evolution.

Findings

Good agreement between model predictions and data/lattice results.

QCD evolution is essential for connecting low-scale models to experimental scales.

Chiral quark models effectively describe generalized parton distributions.

Abstract

Results of the chiral quark models for the soft matrix elements involving pions and photons, relevant for high-energy processes, are reviewed. We discuss quantities related to the generalized parton distributions of the pion: the parton distribution functions, the parton distribution amplitudes, and the generalized form factors. The model predictions are compared to the data or lattice simulations, with good agreement. The QCD evolution from the low quark model scale up to the experimental scales is a crucial ingredient of the approach.