Sehgal and Hung and Sakurai have recently argued that neutrino-hadron neutral-current couplings must lie in one of two allowed regions in coupling-parameter space. We study this conjecture using realistic BNL νμ and ν̄μ spectra in the elastic νμp (ν̄μp) calculations and also study constraints imposed by theq2-distributions. On comparing to gauge models, we find that the Weinberg-Salam and SU(2)L×SU(2)R×U(1) models fall within one allowed region, while a vectorlike SU(3)×U(1) model and a hybrid SU(2)×U(1) model with a (u, b)R doublet fall in the other region.
All Science Journal Classification (ASJC) codes
- Nuclear and High Energy Physics