Reconstruction and Measurement of $\mathcal{O}$(100) MeV Energy Electromagnetic Activity from ${\pi }^0\to \gamma \gamma$ Decays in the MicroBooNE LArTPC

Abstract

We present results on the reconstruction of electromagnetic (EM) activity from photons produced in charged current ${\nu }_{\mu }$ interactions with final state ${\pi }^0$s. We employ a fully-automated reconstruction chain capable of identifying EM showers of $\mathcal{O}$(100) MeV energy, relying on a combination of traditional reconstruction techniques together with novel machine-learning approaches. These studies demonstrate good energy resolution, and good agreement between data and simulation, relying on the reconstructed invariant ${\pi }^0$ mass and other photon distributions for validation. The reconstruction techniques developed are applied to a selection of ${\nu }_{\mu }+\mathrm{Ar}\to \mu +{\pi }^0+X$ candidate events to demonstrate the potential for calorimetric separation of photons from electrons and reconstruction of ${\pi }^0$ kinematics.

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