Quark distribution functions in the chiral quark-soliton model: cancellation of quantum anomalies

TL;DR

This paper investigates the polarized quark distribution functions within the chiral quark-soliton model, demonstrating the cancellation of quantum anomalies in specific distributions through analytical calculations and regularization techniques.

Contribution

It provides an explicit analytical demonstration that the quantum anomaly cancels in the polarized isoscalar distribution and shows how to regularize the isovector distribution using Pauli-Villars subtraction.

Findings

Anomaly is absent in the polarized isoscalar distribution.

Pauli-Villars subtraction cancels anomaly in the polarized isovector distribution.

Polarized quark distributions are consistent with anomaly cancellation in the model.

Abstract

In the framework of the chiral quark-soliton model of the nucleon we investigate the properties of the polarized quark distribution. In particular we analyse the so called anomalous difference between the representations of the quark distribution functions in terms of occupied and non-occupied quark states. By an explicit analytical calculation it is shown that this anomaly is absent in the polarized isoscalar distribution \Delta u + \Delta d, which is ultaviolet finite. In the case of the polarized isovector quark distribution \Delta u - \Delta d the anomaly can be cancelled by a Pauli-Villars subtraction which is also needed for the regularization of the ultraviolet divergence.