Measurement of neutrino-proton and antineutrino-proton elastic scattering

Measurements of the semileptonic weak-neutral-current reactions ν_μp{→}ν_μp and {ν}_μp{→}{ν}_μp are presented. The experiment was performed using a 170-metric-ton high-resolution target detector in the BNL wide-band neutrino beam. High-statistics samples yield the absolute differential cross sections d{σ}(ν_μp)/dQ² and d{σ}({ν}_μp)/dQ². A measurement of the axial-vector form factor GA(Q²) is also presented. The results are in good agreement with the standard model SU(2)×{}U(1). The weak-neutral-current parameter sin²{theta}W$ is determined to be ${sin}²θW=0.220±{}0.016(stat)_-0.031+0.023(syst).