FSI Uncertainties in DUNE-PRISM at Various Off-Axis Angles
摘要
Neutrino experiments often use heavy nuclear targets to achieve high-statistics neutrino-nucleus interaction event rates, but this introduces systematic uncertainties in oscillation parameters due to nuclear effects and cross-section uncertainties. A precise understanding of neutrino-nucleus interactions is essential for accurately determining these parameters. DUNE-PRISM uses a movable near detector to sample neutrino interactions at different off-axis angles, allowing measurements across a range of neutrino energy spectra from the same beamline. This study examines the uncertainty in reconstructing neutrino energy of quasi-elastic (QE) events at various off-axis positions using the calorimetric method. As the detector moves off-axis, uncertainties in energy reconstruction increase in the QE region ( \(\sim \) 1–2 GeV), particularly at 41.81 and 52.26 milliradian off-axis positions. Our results show that final state interaction (FSI) effects contribute significantly to uncertainties in this energy range at these angles, quantified using the Transverse Kinematic Imbalance (TKI) approach.