Measurement of sin2θw and ϱ in deep inelastic neutrino-nucleon scattering

Abstract We describe a high statistics measurement from deep inelastic neutrino-nucleon scattering of the electroweak parameters ϱ and sin 2 θ w , performed in the Fermilab narrow-band neutrino beam. Our measurement uses a radius-dependent cut in y = E H / E v which reduces the systematic error in sin 2 θ w , and incorporates electromagnetic and electroweak radiative corrections. In a renormalization scheme where sin 2 θ w ≡ 1− m 2 W / m 2 Z , a value of sin 2 θ w = 0.242±0.011±0.005 is obtained fixing ϱ = 1. If both sin 2 θ w and ϱ are allowed to vary in a fit to our data, we measure ϱ = 0.991 ± 0.025 ± 0.009.