Abstract
We report on the first cross section measurement of charged-current single charged pion production by neutrinos and antineutrinos on argon. This analysis was performed using the ArgoNeuT detector exposed to the NuMI beam at Fermilab. The measurements are presented as functions of muon momentum, muon angle, pion angle, and angle between muon and pion. The flux-averaged cross sections are measured to be $2.7\pm0.5(stat)\pm0.5(syst) \times 10^{-37} \textrm{cm}^{2}/\textrm{Ar}$ for neutrinos at a mean energy of 9.6 GeV and $8.4\pm0.9(stat)^{+1.0}_{-0.8}(syst) \times 10^{-38} \textrm{cm}^{2}/\textrm{Ar}$ for antineutrinos at a mean energy of 3.6 GeV with the charged pion momentum above 100 MeV/$c$. The results are compared with several model predictions.
Highlights
Precision neutrino cross section measurements are crucial in order to fully characterize the properties of the neutrino-nucleus interaction
We report on the first cross section measurement of charged-current single charged pion production by neutrinos and antineutrinos on argon
Hadrons produced in neutrino-nucleus interactions may re-scatter while propagating through the nuclear medium, referred to as final-state interactions (FSI), and can change the charge and multiplicity of the outgoing hadrons, as well as altering their kinematics [10,11]
Summary
Precision neutrino cross section measurements are crucial in order to fully characterize the properties of the neutrino-nucleus interaction. Charged-current single pion production (CC1πÆ) is an important process in few-GeV neutrino-nucleus interactions. Hadrons produced in neutrino-nucleus interactions may re-scatter while propagating through the nuclear medium, referred to as final-state interactions (FSI), and can change the charge and multiplicity of the outgoing hadrons, as well as altering their kinematics [10,11]. The ArgoNeuT CC1πÆ cross section measurement will provide useful information on the single pion production to the Monte Carlo (MC) generators, improving the constraints on both resonant pion production and FSI models. These data will be of particular benefit to the planned DUNE experiment [17], which will use argon as the target in its far detector
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