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We report results from a search for neutrino-induced neutral current (NC)resonant $\Delta$(1232) baryon production followed by $\Delta$ radiative decay,with a $\langle0.8\rangle$~GeV neutrino beam. Data corresponding toMicroBooNE's first three years of operations (6.80$\times$10$^{20}$ protons ontarget) are used to select single-photon events with one or zero protons andwithout charged leptons in the final state ($1\gamma1p$ and $1\gamma0p$,respectively). The background is constrained via an in-situ high-puritymeasurement of NC $\pi^0$ events, made possible via dedicated $2\gamma1p$ and$2\gamma0p$ selections. A total of 16 and 153 events are observed for the$1\gamma1p$ and $1\gamma0p$ selections, respectively, compared to a constrainedbackground prediction of $20.5 \pm 3.65 \text{(sys.)} $ and $145.1 \pm 13.8\text{(sys.)} $ events. The data lead to a bound on an anomalous enhancement ofthe normalization of NC $\Delta$ radiative decay of less than $2.3$ times thepredicted nominal rate for this process at the 90% confidence level (CL). Themeasurement disfavors a candidate photon interpretation of the MiniBooNElow-energy excess as a factor of $3.18$ times the nominal NC $\Delta$ radiativedecay rate at the 94.8% CL, in favor of the nominal prediction, and representsa greater than $50$-fold improvement over the world's best limit onsingle-photon production in NC interactions in the sub-GeV neutrino energyrange

physical review letters

Search for Neutrino-Induced Neutral Current $\Delta$ Radiative Decay in  MicroBooNE and a First Test of the MiniBooNE Low Energy Excess Under a  Single-Photon Hypothesis