Low $ \mathbf{Q^2}$ Spin Structure Results from Jefferson Lab

There is a pressing need for experimental measurements capable of testing chiral perturbation theory and other long distance effective theories. One of the most valuable quantities for performing low $𝑄^2$ comparisons between experiment and theory is that of the nucleon spin structure function. The spin structure functions $𝑔_1$ and $𝑔_2$ enable direct tests of effective theories of QCD through their moments, and a series of sum rules involving their integration. The Thomas Jefferson National Accelerator (JLab) in Newport News, VA, USA, has hosted a highly successful and ongoing program to measure these quantities over a broad kinematic range. In particular, the last few years have produced newly published JLab results measuring these spin structure functions at low $𝑄^2$ for both the proton and the neutron. In this proceedings, these recent low $𝑄^2$ spin structure results are summarized, along with prospects for future measurements.

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Publication Details

Published
2025-04-09
DOI
https://doi.org/10.22323/1.479.0027
Primary Topic
Atomic and Subatomic Physics Research
Type
article
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article

Low $ \mathbf{Q^2}$ Spin Structure Results from Jefferson Lab

David Ruth
Atomic and Subatomic Physics Research
article

Low $ \mathbf{Q^2}$ Spin Structure Results from Jefferson Lab

David Ruth
article en

Abstract

There is a pressing need for experimental measurements capable of testing chiral perturbation theory and other long distance effective theories. One of the most valuable quantities for performing low $𝑄^2$ comparisons between experiment and theory is that of the nucleon spin structure function. The spin structure functions $𝑔_1$ and $𝑔_2$ enable direct tests of effective theories of QCD through their moments, and a series of sum rules involving their integration. The Thomas Jefferson National Accelerator (JLab) in Newport News, VA, USA, has hosted a highly successful and ongoing program to measure these quantities over a broad kinematic range. In particular, the last few years have produced newly published JLab results measuring these spin structure functions at low $𝑄^2$ for both the proton and the neutron. In this proceedings, these recent low $𝑄^2$ spin structure results are summarized, along with prospects for future measurements.

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