Study ofνdcharged-current two-pion production in the threshold region

Citations Over TimeTop 12% of 1983 papers

Abstract

We present our final results on double-pion production by muon-type neutrinos observed in a 2.4\ifmmode\times\else\texttimes\fi{}${10}^{6}$ (365 000) picture exposure of the Argonne 12-foot deuterium- (hydrogen-) filled bubble chamber. The reactions $\ensuremath{\nu}d\ensuremath{\rightarrow}{\ensuremath{\mu}}^{\ensuremath{-}}{\ensuremath{\pi}}^{\ensuremath{-}}{\ensuremath{\pi}}^{+}p{p}_{s}$, $\ensuremath{\nu}d\ensuremath{\rightarrow}{\ensuremath{\mu}}^{\ensuremath{-}}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{0}p{n}_{s}$, and $\ensuremath{\nu}d\ensuremath{\rightarrow}{\ensuremath{\mu}}^{\ensuremath{-}}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{+}n{n}_{s}$ are studied. The data, which shows strong $\ensuremath{\Delta}(1236)$ production, has nucleon-$\ensuremath{\pi}\ensuremath{-}\ensuremath{\pi}$ mass distribution peaked at low masses in all three reactions. The excitation functions for the three reactions exhibit a rapid rise over the energy range from threshold up to about 3 GeV, but thereafter the energy dependence appears less pronounced. The threshold behavior of the cross sections for these reactions is analyzed in the context of a model developed by Adjei, Dicus, and Teplitz. Data from the constrained reaction, $\ensuremath{\nu}d\ensuremath{\rightarrow}{\ensuremath{\mu}}^{\ensuremath{-}}{\ensuremath{\pi}}^{\ensuremath{-}}{\ensuremath{\pi}}^{+}p{p}_{s}$, satisfy the Adler conserved-vector-current test.

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