A Neutral Current Constraint and Gauge Model

43 The experimental observation R’/RV < c$/$ , i. e. , ok > c& where cc N , are the v-(5-) induced charged and neutral current inclusive cross sections on an isospin 0 nucleon and R provides a constraint on the possible quark representations among various SU(2) x U(1) gauge models. We have examined the energy dependence of both V-(i?-) induced charged and neutral current processes in the models which respect the constraint. Some of the models contain one or a few heavy quarks with an exotic charge of Q=5/3 and/or -4/3. (Submitted to Phys. Rev. ) *Supported in part by the Energy Research and Development Administration under contract grant No. E(ll-l)-2232B. **Supported in part by the Energy Research and Development Administration under contract No. AT(ll-l)-1545. j-Supported by the Energy Research and Development Administration under contract No. E(04-3)-5 15.