Determining the Neutrino-Hadron Weak Neutral-Current Couplings

It has been argued recently that the inclusive, semi-inclusive, and elastic neutrinohadron data require the neutral-current parameters to lie in one of two allowed regions in coupling-parameter space (called regions $A$ and $B$). We remark in this paper that new measurements of $\nu \left(\overline{\nu }\right)p\to \nu \left(\overline{\nu }\right)p$ strongly favor region $A$ [which corresponds to the standard $\mathrm{SU}{\mathrm{}\left(2\right)\mathrm{}}_L\otimes \mathrm{U}\mathrm{}\left(1\right)\mathrm{}$ and $\mathrm{SU}{\mathrm{}\left(2\right)\mathrm{}}_L\otimes \mathrm{SU}{\mathrm{}\left(2\right)\mathrm{}}_R\otimes \mathrm{U}\mathrm{}\left(1\right)\mathrm{}$ models] over region $B$ [which corresponds to an SU(2) ⊗ U(1) model with a ${(u, b)}_R$ doublet and $d_R$ singlet]. Neutral-current couplings of $u$ and $d$ quarks determined by this analysis are given.