Measurement of ${\bar{\nu }}_{\mu }$ charged-current single ${\pi }^{-}$ production on hydrocarbon in the few-GeV region using MINERvA

Abstract

The antineutrino scattering channel ${\bar{\nu }}_{\mu }\text{CH}\to {\mu }^{+}{\pi }^{-}X$(nucleon(s)) is analyzed in the incident energy range 1.5 to 10 GeV using the MINERvA detector at Fermilab. Differential cross sections are reported as functions of ${\mu }^{+}$ momentum and production angle, ${\pi }^{-}$ kinetic energy and production angle, and antineutrino energy and squared four-momentum transfer. Distribution shapes are generally reproduced by simulations based on the GENIE, NuWro, and GiBUU event generators, however GENIE (GiBUU) overestimates (underestimates) the cross-section normalizations by 8% (10%). Comparisons of data with the GENIE-based reference simulation probe conventional treatments of cross sections and pion intranuclear rescattering. The distribution of non-track vertex energy is used to decompose the signal sample into reaction categories, and cross sections are determined for the exclusive reactions ${\mu }^{+}{\pi }^{-}n$ and ${\mu }^{+}{\pi }^{-}p$. A similar treatment applied to the published MINERvA sample ${\bar{\nu }}_{\mu }\text{CH}\to {\mu }^{+}{\pi }^{0}X$(nucleon(s)) has determined the ${\mu }^{+}{\pi }^{0}n$ cross section, and the latter is used with $\sigma ({\pi }^{-}n)$ and $\sigma ({\pi }^{-}p)$ to carry out an isospin decomposition of ${\bar{\nu }}_{\mu }$-induced CC($\pi$). The ratio of magnitudes and relative phase for isospin amplitudes $A_3$ and $A_1$ thereby obtained are: $R^{\bar{\nu }}=0.99\pm 0.19$ and ${\varphi }^{\bar{\nu }}=93^{\circ }\pm 7^{\circ }$. Our results are in agreement with bubble chamber measurements made four decades ago.

arXiv comment22 pages, 17 figures

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• Recent highlights from GENIE v3
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• Pion-proton correlation in neutrino interactions on nuclei
• Exploring Neutrino-Nucleus Interactions in the GeV Regime using MINERvA
• Assessing the theory-data tension in neutrino-induced charged pion production: the effect of final-state nucleon distortion
• Measurements of protons and charged pions emitted from ${\nu }_{\mu }$ charged-current interactions on iron at a mean neutrino energy of 1.49GeV using a nuclear emulsion detector
• Comparison of Validation Methods of Simulations for Final State Interactions in Hadron Production Experiments
• Towards a more complete description of nucleon distortion in lepton-induced single-pion production at low-$Q^2$
• Measurement of single charged pion production in charged-current ${\nu }_{\mu }$-Ar interactions with the MicroBooNE detector
• Status and Perspectives of Neutrino Physics
• Towards a Unified Model of Neutrino-Nucleus Interactions
• Measurement of inclusive charged-current ${\nu }_{\mu }$ cross sections as a function of muon kinematics at $<E_{\nu }>\sim 6GeV$ on hydrocarbon
• Sampling Off-Axis Neutrino Fluxes with the Short-Baseline Near Detector