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This article presents a measurement of $\nu_e$ interactions without pions inthe final state using the MicroBooNE experiment and an investigation into theexcess of low-energy electromagnetic events observed by the MiniBooNEcollaboration. The measurement is performed in exclusive channels with(1$e$N$p$0$\pi$) and without (1$e$0$p$0$\pi$) visible final-state protons using6.86$\times 10^{20}$ protons on target of data collected from the BoosterNeutrino Beam at Fermilab. Events are reconstructed with the Pandora patternrecognition toolkit and selected using additional topological information fromthe MicroBooNE liquid argon time projection chamber. Using a goodness-of-fittest the data are found to be consistent with the predicted number of eventswith nominal flux and interaction models with a $p$-value of 0.098 in the twochannels combined. A model based on the low-energy excess observed in MiniBooNEis introduced to quantify the strength of a possible $\nu_e$ excess. Theanalysis suggests that if an excess is present, it is not consistent with asimple scaling of the $\nu_e$ contribution to the flux. Combined, the1$e$N$p$0$\pi$ and 1$e$0$p$0$\pi$ channels do not give a conclusive indicationabout the tested model, but separately they both disfavor the low-energy excessmodel at $>$90% CL. The observation in the most sensitive 1$e$N$p$0$\pi$channel is below the prediction and consistent with no excess. In the lesssensitive 1$e$0$p$0$\pi$ channel the observation at low energy is above theprediction, while overall there is agreement over the full energy spectrum.

Search for an anomalous excess of charged-current $\nu_e$ interactions without pions in the final state with the MicroBooNE experiment