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- W4387596564 abstract "We present the first search for heavy neutral leptons (HNL) decaying into $nu e^+e^-$ or $nupi^0$ final states in a liquid-argon time projection chamber using data collected with the MicroBooNE detector. The data were recorded synchronously with the NuMI neutrino beam from Fermilab's Main Injector corresponding to a total exposure of $7.01 times 10^{20}$ protons on target. We set upper limits at the $90%$ confidence level on the mixing parameter $lvert U_{mu 4}rvert^2$ in the mass ranges $10le m_{rm HNL}le 150$ MeV for the $nu e^+e^-$ channel and $150le m_{rm HNL}le 245$ MeV for the $nupi^0$ channel, assuming $lvert U_{e 4}rvert^2 = lvert U_{tau 4}rvert^2 = 0$. These limits represent the most stringent constraints in the mass range $35<m_{rm HNL}<175$ MeV and the first constraints from a direct search for $nupi^0$ decays." @default.
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