Measurements of Pion and Muon Nuclear Capture at Rest on Argon in the LArIAT Experiment
We report the measurement of the final-state products of negative pion and muon nuclear capture at rest on argon by the LArIAT experiment at the Fermilab Test Beam Facility. We measure a population of isolated MeV-scale energy depositions, or blips, in 296 LArIAT events containing tracks from stoppi...
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Zusammenfassung: | We report the measurement of the final-state products of negative pion and
muon nuclear capture at rest on argon by the LArIAT experiment at the Fermilab
Test Beam Facility. We measure a population of isolated MeV-scale energy
depositions, or blips, in 296 LArIAT events containing tracks from stopping
low-momentum pions and muons. The average numbers of visible blips are measured
to be 0.74 $\pm$ 0.19 and 1.86 $\pm$ 0.17 near muon and pion track endpoints,
respectively. The 3.6$\sigma$ statistically significant difference in blip
content between muons and pions provides the first demonstration of a new
method of pion-muon discrimination in neutrino liquid argon time projection
chamber experiments. LArIAT Monte Carlo simulations predict substantially
higher average blip counts for negative muon (1.22 $\pm$ 0.08) and pion (2.34
$\pm$ 0.09) nuclear captures. We attribute this difference to Geant4's
inaccurate simulation of the nuclear capture process. |
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DOI: | 10.48550/arxiv.2408.05133 |