Accessing weak neutral-current coupling $g_{AA}^{eq}$ using positron and electron beams at Jefferson Lab
Abstract
Low-energy neutral-current couplings arising in the Standard Model of electroweak interactions can be constrained in lepton scattering off hydrogen or a nuclear fixed target. Recent polarized electron scattering experiments at Jefferson Lab (JLab) have improved the precision in the parity-violating types of effective couplings. On the other hand, the only known way to access the parity-conserving counterparts is to compare scattering cross sections between a lepton and an anti-lepton beam. We review the current knowledge of both types of couplings and how to constrain them. We also present exploratory calculations for a possible measurement of using the planned SoLID spectrometer combined with a possible positron beam at JLab.
Cite
@article{arxiv.2103.12555,
title = {Accessing weak neutral-current coupling $g_{AA}^{eq}$ using positron and electron beams at Jefferson Lab},
author = {Xiaochao Zheng and Jens Erler and Qishan Liu and Huber Spiesberger},
journal= {arXiv preprint arXiv:2103.12555},
year = {2023}
}
Comments
8 pages, 6 figures, manuscript accepted by EPJA