Charged pion polarizability in the nonlocal quark model of Nambu-Jona-Lasinio type

TL;DR

This paper estimates the charged pion polarizability using a nonlocal Nambu-Jona-Lasinio quark model, highlighting its sensitivity to nonlocality form factors and model parameters.

Contribution

It introduces a nonlocal chiral quark model with Gaussian form factors to study pion polarizability, emphasizing the impact of nonlocality on the results.

Findings

Polarizability is highly sensitive to nonlocal form factors.

Model parameters significantly influence the estimated polarizability.

The approach provides insights into nonlocal effects in hadronic structure.

Abstract

The polarizability of a charged pion is estimated in the framework of the nonlocal chiral quark model of the Nambu--Jona-Lasinio type. Nonlocality is described by quark form factors of the Gaussian type. It is shown that the polarizability in this model is very sensitive to the form of nonlocality and choice of the model parameters.