Search for Heavy Neutral Leptons in Electron-Positron and Neutral-Pion Final States with the MicroBooNE Detector

MicroBooNE Collaboration

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2 Scopus citations

Abstract

We present the first search for heavy neutral leptons (HNLs) decaying into νe+e- or νπ0 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 7.01×1020 protons on target. We set upper limits at the 90% confidence level on the mixing parameter |Uμ4|2 in the mass ranges 10≤mHNL≤150 MeV for the νe+e- channel and 150≤mHNL≤245 MeV for the νπ0 channel, assuming |Ue4|2=|Uτ4|2=0. These limits represent the most stringent constraints in the mass range 35<mHNL<175 MeV and the first constraints from a direct search for νπ0 decays.

Original languageEnglish (US)
Article number041801
JournalPhysical Review Letters
Volume132
Issue number4
DOIs
StatePublished - Jan 26 2024

ASJC Scopus subject areas

  • General Physics and Astronomy

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