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 dσ(ν_μp)/dQ² and dσ(ν¯_μp)/dQ². A measurement of the axial-vector form factor G_A(Q²) is also presented. The results are in good agreement with the standard model SU(2)×U(1). The weak-neutral-current parameter sin²theta_W is determined to be sin²θ_W=0.220+/-0.016(stat)^+0.023_-0.031(syst).