Study of the Reactionνp→μ−π+p

Abstract

We present an analysis of 153 events of the reaction $\nu p\to {\mu }^{-}{\pi }^{+}p$ at an average neutrino energy of 1 GeV. The results were obtained using the Argonne 12-ft hydrogen bubble chamber. The reaction is dominated by ${\mu }^{-}{\Delta }^{++}\mathrm{}\left(1236\right)\mathrm{}$ production for which the total cross section rises from threshold to a value of (0.74±0.18)×${10}^{-38\mathrm{}}$ ${\mathrm{cm}}^2$ at $E_{\nu }\gtrsim 1.0$ GeV. The production and decay angular distributions of the ${\Delta }^{++}$ are given. There is no evidence for hadron-lepton mass enhancements.