https://doi.org/10.1140/epja/s10050-021-00490-z
Regular Article - Experimental Physics
Accessing weak neutral-current coupling 
using positron and electron beams at Jefferson Lab
1
Department of Physics, University of Virginia, 382 McCormick Rd, 22904, Charlottesville, VA, USA
2
PRISMA+ Cluster of Excellence, Institute for Nuclear Physics, Johannes Gutenberg-University, 55099, Mainz, Germany
3
PRISMA+ Cluster of Excellence, Institute of Physics, Johannes Gutenberg-University, 55099, Mainz, Germany
Received:
23
March
2021
Accepted:
14
May
2021
Published online:
27
May
2021
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.
© The Author(s), under exclusive licence to Società Italiana di Fisica and Springer-Verlag GmbH Germany, part of Springer Nature 2021
