Measurement of ${\nu }_{\mu }$ charged-current single ${\pi }^0$ production on hydrocarbon in the few-GeV region using MINERvA

Abstract

The semi-exclusive channel ${\nu }_{\mu }+\text{CH}\to {\mu }^{-}{\pi }^0+\text{nucleon(s)}$ is analyzed using MINERvA exposed to the low-energy NuMI ${\nu }_{\mu }$ beam with spectral peak at $E_{\nu }\simeq 3$ GeV. Differential cross sections for muon momentum and production angle, ${\pi }^0$ kinetic energy and production angle, and for squared four-momentum transfer are reported, and the cross section $\sigma (E_{\nu })$ is obtained over the range 1.5 GeV $\le E_{\nu }<$ 20 GeV. Results are compared to GENIE and NuWro predictions and to published MINERvA cross sections for ${\nu }_{\mu }\text{-CC}({\pi }^{+})$ and ${\bar{\nu }}_{\mu }\text{-CC}({\pi }^0)$. Disagreements between data and simulation are observed at very low and relatively high values for muon angle and for $Q^2$ that may reflect shortfalls in modeling of interactions on carbon. For ${\pi }^0$ kinematic distributions however, the data are consistent with the simulation and provide support for generator treatments of pion intranuclear scattering. Using signal-event subsamples that have reconstructed protons as well as ${\pi }^0$ mesons, the $p{\pi }^0$ invariant mass distribution is obtained, and the decay polar and azimuthal angle distributions in the rest frame of the $p{\pi }^0$ system are measured in the region of $\Delta (1232{)}^{+}$ production, $W<1.4$ GeV.

arXiv comment19 pages, 22 figures

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