Comparison of νμ-Ar multiplicity distributions observed by MicroBooNE to GENIE model predictions

We measure a large set of observables in inclusive charged current muon neutrinoscattering on argon with the MicroBooNE liquid argon time projection chamberoperating at Fermilab. We evaluate three neutrinointeraction models based on the widely used GENIE event generatorusing these observables. The measurementuses a data set consisting of neutrinointeractions with a final state muon candidate fully contained within the MicroBooNE detector. These data were collected in 2016 with the FermilabBooster NeutrinoBeam, which has an average neutrinoenergy of 800 MeV, using an exposure corresponding to 5e19 protons-on-target. The analysis employs fully automatic event selection and charged particle track reconstruction and uses a data-driven technique to separate neutrinointeractions from cosmic ray background events. We find that GENIE models consistently describe the shapes of a large number of kinematic distributions for fixed observed multiplicity, but we show an indication that the observed multiplicity fractions deviate from GENIE expectations.