Calorimetry for low-energy electrons using charge and light in liquid argon
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2020
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Precise calorimetric reconstruction of 5–50 MeV electrons in liquid argon time projection chambers
(LArTPCs) will enable the study of astrophysical neutrinos in DUNE and could enhance the physics reach
of oscillation analyses. Liquid argon scintillation light has the potential to improve energy reconstruction
for low-energy electrons over charge-based measurements alone. Here we demonstrate light-augmented
calorimetry for low-energy electrons in a single-phase LArTPC using a sample of Michel electrons from
decays of stopping cosmic muons in the LArIAT experiment at Fermilab. Michel electron energy spectra
are reconstructed using both a traditional charge-based approach as well as a more holistic approach that
incorporates both charge and light. A maximum-likelihood fitter, using LArIAT’s well-tuned simulation, is
developed for combining these quantities to achieve optimal energy resolution. A sample of isolated
electrons is simulated to better determine the energy resolution expected for astrophysical electron-neutrino
charged-current interaction final states. In LArIAT, which has very low wire noise and an average light yield of 18 pe=MeV, an energy resolution of σ=E ≃ 9.3%= ffiffiffiffi
E p ⊕ 1.3% is achieved. Samples are then
generated with varying wire noise levels and light yields to gauge the impact of light-augmented
calorimetry in larger LArTPCs. At a charge-readout signal-to-noise of S=N ≃ 30, for example, the energy
resolution for electrons below 40 MeV is improved by ≈10%, ≈20%, and ≈40% over charge-only
calorimetry for average light yields of 10 pe=MeV, 20 pe=MeV, and 100 pe=MeV, respectively.
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FOREMAN, W. et al. Calorimetry for low-energy electrons using charge and light in liquid argon. Physical Review D, Washington, v. 101, n. 1, e012010, 2020. DOI: 10.1103/PhysRevD.101.012010. Disponível em: https://journals.aps.org/prd/abstract/10.1103/PhysRevD.101.012010. Acesso em: 16 maio 2023.