Single-Pion Production in Neutrino and Antineutrino Reactions

We have studied the neutral-current reactions ${\nu }_{\mu }N\to {\nu }_{\mu }{N}^{\prime }{\pi }^0$ and ${\overline{\nu }}_{\mu }N\to {\overline{\nu }}_{\mu }{N}^{\prime }{\pi }^0$ and compared them to the charged-current reactions ${\nu }_{\mu }N\to {\mu }^{-}{N}^{\prime \prime }{\pi }^0$ and ${\overline{\nu }}_{\mu }N\to {\mu }^{+}{N}^{\prime \prime }{\pi }^0$. We have measured the ratios ${R_0}^{\prime }=\frac{\sigma ({\nu }_{\mu }N\to {\nu }_{\mu }{N}^{\prime }{\pi }^0)}{2\sigma ({\nu }_{\mu }N\to {\mu }^{-}{N}^{\prime \prime }{\pi }^0)}$ and ${{\overline{R}}_0}^{\prime }=\frac{\sigma ({\overline{\nu }}_{\mu }N\to {\overline{\nu }}_{\mu }{N}^{\prime }{\pi }^0)}{2\sigma ({\overline{\nu }}_{\mu }N\to {\mu }^{+}{N}^{\prime \prime }{\pi }^0)}$ to be 0.17±0.04 and 0.39±0.18, respectively. We also present the ${\pi }^{0}p$ invariant-mass distribution of the neutrino-induced reactions.