First measurement of the cross section for $\nu_\mu$ and $\bar{\nu}_\mu$ induced single charged pion production on argon using ArgoNeuT

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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/$c$.