Isospin-½ nucleon-resonance production by aV,Aweak neutral current

摘要: A set of ratios characterizing the production isospin-1/2 resonances D$sub 13$(1514) and S$sub 11$(1505), as well isospin-3/2 resonance P$sub 33$(1232), by electromagnetic weak (charged neutral) currents are defined. Assuming most general neutral current with V, spatial structure, matrix elements needed to extract calculated in three dynamical models for production: Born- approximation model, nonrelativistic quark quark-bag model. For special case Weinberg-Salam theory current, suggest that 0 < or = sin$sup 2$theta/subW/ 0.5 13$/P$sub 33$ 11$/P$sub observed neutral-current $pi$$sup 0$ eta on a free nucleon target should be substantially smaller (by factor 2 4) than corresponding charged-current production. An attempt is made predict expected from electroproduction, but here do not agree, so it possible only state wide range which values may lie. The charge-exchange corrections comparison experiments complex nuclear targets briefly discussed; found an aluminum reduction factors quoted above halved, neutral-current-induced reactions 1 charged-current--induced reactions. (AIP)