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First Search for Neutral Current Coherent Single-Photon Production in MicroBooNE
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First Search for Neutral Current Coherent Single-Photon Production in MicroBooNE
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This article presents the first search for neutrino-induced neutral current coherent single-photon production (NC coherent 1$\gamma$). The search makes use of data from the MicroBooNE 85-tonne active volume liquid argon time projection chamber detector, situated in the Fermilab Booster Neutrino Beam (BNB), with an average neutrino energy of $\langle E_{\nu}\rangle \sim 0.8$ GeV. A targeted selection of candidate neutrino interactions with a single photon-like electromagnetic shower in the final state and no visible vertex activity was developed to search for the NC coherent 1$\gamma$ process, along with two auxiliary selections used to constrain the dominant background from NC$\pi^0$ production. With an integrated exposure of $6.87 \times 10^{20}$ protons on target delivered by the BNB, we set the world's first limit for this rare process, corresponding to an upper limit on the flux-averaged cross section of $\sigma<1.49 \times 10^{-41}\text{cm}^2$ at 90\% C.L.
Forward citations
Cited by 1 Pith paper
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Inclusive Search for Anomalous Single-Photon Production in MicroBooNE
MicroBooNE performs a blind search for anomalous single-photon events and finds agreement overall but a ~2σ excess in the proton-free subsample at energies below 600 MeV.
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