Measurements of Pion and Muon Nuclear Capture at Rest on Argon in the LArIAT Experiment
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2024
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| author | Hernandez-Morquecho, M. A. Acciarri, R. Asaadi, J. Backfish, M. Badgett, W. Basque, V. Blaszczyk, F. d. M. Foreman, W. Gomes, R. Gramellini, E. Ho, J. Kearns, E. Kemp, E. Kobilarcik, T. King, M. Littlejohn, B. R. Luo, X. Marchionni, A. Moura, C. A. Raaf, J. L. Schmitz, D. W. Soderberg, M. John, J. M. St. Szelc, A. M. Yang, T. |
| author_facet | Hernandez-Morquecho, M. A. Acciarri, R. Asaadi, J. Backfish, M. Badgett, W. Basque, V. Blaszczyk, F. d. M. Foreman, W. Gomes, R. Gramellini, E. Ho, J. Kearns, E. Kemp, E. Kobilarcik, T. King, M. Littlejohn, B. R. Luo, X. Marchionni, A. Moura, C. A. Raaf, J. L. Schmitz, D. W. Soderberg, M. John, J. M. St. Szelc, A. M. Yang, T. |
| contents | 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$σ$ 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. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2408_05133 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Measurements of Pion and Muon Nuclear Capture at Rest on Argon in the LArIAT Experiment Hernandez-Morquecho, M. A. Acciarri, R. Asaadi, J. Backfish, M. Badgett, W. Basque, V. Blaszczyk, F. d. M. Foreman, W. Gomes, R. Gramellini, E. Ho, J. Kearns, E. Kemp, E. Kobilarcik, T. King, M. Littlejohn, B. R. Luo, X. Marchionni, A. Moura, C. A. Raaf, J. L. Schmitz, D. W. Soderberg, M. John, J. M. St. Szelc, A. M. Yang, T. High Energy Physics - Experiment Instrumentation and Detectors 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$σ$ 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. |
| title | Measurements of Pion and Muon Nuclear Capture at Rest on Argon in the LArIAT Experiment |
| topic | High Energy Physics - Experiment Instrumentation and Detectors |
| url | https://arxiv.org/abs/2408.05133 |