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We report an updated measurement of the $\nu_{\mu}$-induced, and the firstmeasurement of the $\bar{\nu}_{\mu}$-induced coherent charged pion productioncross section on $^{12}C$ nuclei in the T2K experiment. This is measured in arestricted region of the final-state phase space for which $p_{\mu,\pi} > 0.2$GeV, $\cos(\theta_{\mu}) > 0.8$ and $\cos(\theta_{\pi}) > 0.6$, and at a mean(anti)neutrino energy of 0.85 GeV using the T2K near detector. The measured$\nu_{\mu}$ CC coherent pion production flux-averaged cross section on $^{12}C$is $(2.98 \pm 0.37 (stat.) \pm 0.31 (syst.) \substack{ +0.49 \\ -0.00 }\mathrm{ (Q^2\,model)}) \times 10^{-40}~\mathrm{cm}^{2}$. The new measurementof the $\bar{\nu}_{\mu}$-induced cross section on $^{12}{C}$ is $(3.05 \pm 0.71(stat.) \pm 0.39 (syst.) \substack{ +0.74 \\ -0.00 } \mathrm{(Q^2\,model)})\times 10^{-40}~\mathrm{cm}^{2}$. The results are compatible with both the NEUT5.4.0 Berger-Sehgal (2009) and GENIE 2.8.0 Rein-Sehgal (2007) modelpredictions.

Measurements of the $\nu_{\mu}$ and $\bar{\nu}_{\mu}$-induced Coherent Charged Pion Production Cross Sections on $^{12}C$ by the T2K experiment