Reconstruction and measurement of <i>𝒪</i>(100) MeV energy electromagnetic activity from π⁰ <i>arrow</i> γγ decays in the MicroBooNE LArTPC

Abstract

We present results on the reconstruction of electromagnetic (EM) activity\nfrom photons produced in charged current $\\nu_{\\mu}$ interactions with final\nstate $\\pi^0$s. We employ a fully-automated reconstruction chain capable of\nidentifying EM showers of $\\mathcal{O}$(100) MeV energy, relying on a\ncombination of traditional reconstruction techniques together with novel\nmachine-learning approaches. These studies demonstrate good energy resolution,\nand good agreement between data and simulation, relying on the reconstructed\ninvariant $\\pi^0$ mass and other photon distributions for validation. The\nreconstruction techniques developed are applied to a selection of $\\nu_{\\mu} +\n{\\rm Ar} \\rightarrow \\mu + \\pi^0 + X$ candidate events to demonstrate the\npotential for calorimetric separation of photons from electrons and\nreconstruction of $\\pi^0$ kinematics.\n