Accessing weak neutral-current coupling $$g_{AA}^{eq}$$ using positron and electron beams at Jefferson Lab

Low-energy neutral-current couplings arising in the Standard Model of electroweak interactions can be constrained lepton scattering off hydrogen or a nuclear fixed target. Recent polarized electron experiments at Jefferson Lab (JLab) have improved precision parity-violating types effective couplings. On other hand, only known way to access parity-conserving counterparts is compare cross sections between and an anti-lepton beam. We review current knowledge both how constrain them. also present exploratory calculations for possible measurement $g_{AA}^{eq}$ using planned SoLID spectrometer combined with positron beam JLab.