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We present here a study of the charged pion-nucleus total interaction cross section in liquid argon performed at the Liquid Argon In A Testbeam (LArIAT) experiment. The LArIAT beam line instrumentation is used to identify the pion candidates and measure their momentum prior to them entering the Liquid Argon TimeProjection Chamber (LArTPC). The calorimetric energy reconstruction of the LArTPC technology enables the measurement of the total differential cross section for pion interactions. The pion-nucleus total interaction cross section has never been measured before on argon and it is a crucial step in shedding light on meson interaction in heavy nuclei. Additionally, since charged pions are produced in noticeable numbers in neutrino-nucleus interactions for neutrino energies of a few GeV, this measurement is a fundamental input to both the Short-Baseline and LongBaseline neutrino programs.

The LArIAT experiment and charged pion total interaction cross section results on liquid argon