Speaker
Description
Neutrino physics has entered an era of precision measurement, and liquid argon time projection chambers (LArTPCs) are a popular detector choice due to their high spatial and energy resolution. The LArTPC-based Deep Underground Neutrino Experiment (DUNE) will enable a broad physics program, studying few-GeV accelerator-based neutrinos. DUNE will observe a high rate of events in which a resonant pion is produced and reabsorbed within a nucleus, resulting in no final-state pions. This process is poorly understood, so direct measurements on argon are needed to constrain modeling uncertainties. In this poster, we present a measurement of the absorption cross section of negative pions on argon using the Liquid Argon In A Testbeam (LArIAT) Experiment, a LArTPC that collected charged-particle beam data at Fermilab's Test Beam Facility from 2015-2017. The beam provided pions with 100-600 MeV of kinetic energy. Results are shown separately for events with 0 and >0 visible protons with a proton detection threshold of 75 MeV. This is the first direct measurement of negative pion absorption on argon, complementing prior results from LADS and ProtoDUNE that used higher-energy positive pions. We compare our measurement to multiple model predictions and to prior pion absorption data on other nuclei.
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