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Precise calorimetric reconstruction of 5-50 MeV electrons in liquid argontime projection chambers (LArTPCs) will enable the study of astrophysicalneutrinos in DUNE and could enhance the physics reach of oscillation analyses.Liquid argon scintillation light has the potential to improve energyreconstruction for low-energy electrons over charge-based measurements alone.Here we demonstrate light-augmented calorimetry for low-energy electrons in asingle-phase LArTPC using a sample of Michel electrons from decays of stoppingcosmic muons in the LArIAT experiment at Fermilab. Michel electron energyspectra are reconstructed using both a traditional charge-based approach aswell as a more holistic approach that incorporates both charge and light. Amaximum-likelihood fitter, using LArIAT's well-tuned simulation, is developedfor combining these quantities to achieve optimal energy resolution. A sampleof isolated electrons is simulated to better determine the energy resolutionexpected for astrophysical electron-neutrino charged-current interaction finalstates. In LArIAT, which has very low wire noise and an average light yield of18 pe/MeV, an energy resolution of $\sigma/E \simeq 9.3\%/\sqrt{E} \oplus1.3\%$ is achieved. Samples are then generated with varying wire noise levelsand light yields to gauge the impact of light-augmented calorimetry in largerLArTPCs. At a charge-readout signal-to-noise of S/N $\simeq$ 30, for example,the energy resolution for electrons below 40 MeV is improved by $\approx$ 10%,$\approx$ 20%, and $\approx$ 40% over charge-only calorimetry for average lightyields of 10 pe/MeV, 20 pe/MeV, and 100 pe/MeV, respectively.

Calorimetry for low-energy electrons using charge and light in liquid argon