Selection of $\Lambda^0$ Production Events in MicroBooNE

doi:10.2172/2397308

DOE OSTI · 2397308

Selection of $\Lambda^0$ Production Events in MicroBooNE

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Abstract

A selection to find Cabibbo suppressed Λ production events, $\overline{ν}_µ$ + Ar → $µ^+$ + $Λ^0$ + $X$, in the MicroBooNE detector is described. This channel is sensitive to cross section and final state interaction parameters in different ways and can help break their degeneracy. $Λ^0$ production events are distinguished from background by the existence of a secondary vertex created when the $Λ^0$ decays. The selection examines a list of reconstructed particles thought to be the result of a neutrino interaction, first finding a muon candidate, then a proton and $π^-$ candidate and testing their consistency with a $Λ^0 → p+π^-$ decay. The selection achieves an efficiency of approximately 7% while rejecting 99.9999% of the background. This selection is designed to study neutrino interactions in the NuMI flux. After applying the selection, Monte Carlo simulation predicts 9.0 ± 0.8 (MC stat.) signal and 3.1 ± 1.4 background events when combining 1.0 × 10 21 protons on target of neutrino mode flux and 1.3 × 10 21 protons on target of anti-neutrino mode flux, corresponding to a significance of 2.6 $σ$.

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2021-10-12. Selection of $\Lambda^0$ Production Events in MicroBooNE. https://doi.org/10.2172/2397308

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