Cross sections forνμandν¯μinduced pion production on hydrocarbon in the few-GeV region using MINERvA

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Abstract

Separate samples of charged-current pion production events representing two semi-inclusive channels ${\ensuremath{\nu}}_{\ensuremath{\mu}}\text{\ensuremath{-}}\mathrm{CC}({\ensuremath{\pi}}^{+})$ and ${\overline{\ensuremath{\nu}}}_{\ensuremath{\mu}}\text{\ensuremath{-}}\mathrm{CC}({\ensuremath{\pi}}^{0})$ have been obtained using neutrino and antineutrino exposures of the MINERvA detector. Distributions in kinematic variables based upon ${\ensuremath{\mu}}^{\ifmmode\pm\else\textpm\fi{}}$-track reconstructions are analyzed and compared for the two samples. The differential cross sections for muon production angle, muon momentum, and four-momentum transfer ${Q}^{2}$ are reported, and cross sections versus neutrino energy are obtained. Comparisons with predictions of current neutrino event generators are used to clarify the role of the $\mathrm{\ensuremath{\Delta}}(1232)$ and higher-mass baryon resonances in CC pion production and to show the importance of pion final-state interactions. For the ${\ensuremath{\nu}}_{\ensuremath{\mu}}\text{\ensuremath{-}}\mathrm{CC}({\ensuremath{\pi}}^{+})$ [${\overline{\ensuremath{\nu}}}_{\ensuremath{\mu}}\text{\ensuremath{-}}\mathrm{CC}({\ensuremath{\pi}}^{0})$] sample, the absolute data rate is observed to lie below (above) the predictions of some of the event generators by amounts that are typically 1-to- $2\ensuremath{\sigma}$. However the generators are able to reproduce the shapes of the differential cross sections for all kinematic variables of either data set.

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