Model calculations of the Sivers function satisfying the Burkardt Sum Rule

TL;DR

This paper demonstrates that the MIT bag model can accurately describe the Sivers function data and satisfy the Burkardt Sum Rule, aligning with recent constituent quark model results and current experimental and theoretical understanding.

Contribution

It shows for the first time that the MIT bag model can both fit the Sivers function data and satisfy the Burkardt Sum Rule within a few percent, matching recent quark model findings.

Findings

MIT bag model explains Sivers function data

Satisfies Burkardt Sum Rule to a few percent

Agreement with constituent quark model results

Abstract

It is shown that, at variance with previous analyses, the MIT bag model can explain the available data of the Sivers function and satisfies the Burkardt Sum Rule to a few percent accuracy. The agreement is similar to the one recently found in the constituent quark model. Therefore, these two model calculations of the Sivers function are in agreement with the present experimental and theoretical wisdom.