We have determined the electroweak parameters ${{sin}^2\theta }_{\mathrm{W}}$ and $\rho$ by a measurement of deep-inelastic neutrino-nucleon scattering used a fine-grained neutrino detector exposed to a narrowband neutrino beam at Fermilab. The sampling properties of our detector have permitted neutralcurrent and charged-current events to be well separated over a wide kinematic range, thereby allowing a determination of ${{sin}^2\theta }_{\mathrm{W}}$ and $\rho$ to be made with good statistics and small systematic errors. We have found ${{sin}^2\theta }_{\mathrm{W}}=0.246\mathrm{}\pm 0.012\pm 0.013$ in a single-parameter fit.

• Received 24 June 1985

DOI:https://doi.org/10.1103/PhysRevLett.55.1969