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We report on the first cross section measurement of charged-current singlecharged pion production by neutrinos and antineutrinos on argon. This analysiswas performed using the ArgoNeuT detector exposed to the NuMI beam at Fermilab.The measurements are presented as functions of muon momentum, muon angle, pionangle, and angle between muon and pion. The flux-averaged cross sections aremeasured 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 withthe charged pion momentum above 100 MeV/$c$. The results are compared withseveral model predictions.

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