Cross sections for neutrino and antineutrino induced pion production on hydrocarbon in the few-GeV region using MINERvA

Abstract

Separate samples of charged-current pion production events representing two semi-inclusive channels ${\nu }_{\mu }$-CC(${\pi }^{+}$) and ${\bar{\nu }}_{\mu }$-CC(${\pi }^0$) have been obtained using neutrino and antineutrino exposures of the MINERvA detector. Distributions in kinematic variables based upon ${\mu }^{\pm }$-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 $\Delta (1232)$ and higher-mass baryon resonances in CC pion production and to show the importance of pion final-state interactions. For the ${\nu }_{\mu }$-CC(${\pi }^{+}$) (${\bar{\nu }}_{\mu }$-CC(${\pi }^0$)) 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 $\sigma$. However the generators are able to reproduce the shapes of the differential cross sections for all kinematic variables of either data set.

arXiv comment17 pages, 16 figures; supplementary materials in Supplement file (TeX and pdf)

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