Abstract
We have measured the excitation function for the neutral current process νn→ νpπ − as a function of neutrino energy. Our data give a cross section ratio R= σ( νp π −)/ σ( μ −p π +)=0.11±0.022 over the energy interval (0.3⩽ E ν ⩽1.5)GeV. This measurement of single-pion production in a kinematically defined reaction is the first to use a deuterium target. The R value, as well as other characteristics of the data, agrees with the Adler model for single-pion production via the neutral current and gives a value of sin 2 θ w=0.26±0.09.
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