Cross Section Systematics in Lars Bathe-Peters lars.bathe-peters@physics.ox.ac.uk Cross Section Systematics in DUNE 2p2h dials and validations Kings College London - 19th December 2023 - NuPhys2023 - Poster Talk CC MEC Data points from: J. A. Formaggio, G. Zeller, Rev. Mod. Phys. 84 (2012), arXiv:1305.7513 [hep-ex] • Simulate CC MEC neutrino interactions with GENIE • Vary parameters and compare predictions to determine uncertainties Why do we want to vary systematic parameters? New Meson Exchange Current Model Uncertainties Energy Dependence Interpolation between Models Nucleon Pair Content • Changes the pn-pair content in the initial nuclear state [1] L. Bathe-Peters, M.S. thesis, Harvard University and Technische Universität Berlin, 2020. [4] S. Dolan, G. D.. Megias, S. Bolognesi, Phys. [2] L. Bathe-Peters , S. Gardiner, R. Guenette., FERMILAB-PUB-22-007-SCD, Jan. 2022. arXiv: 2201.04664 [hep-ph]. Rev. D, 101, 20 Feb. 2020 [3] P. Abratenko, R. An, J. Anthony, et al., Phys. Rev. D, 105, 7 Apr. 2022. • Develop systematic fit parameters to enhanced theory-driven simulation predictions • Understanding the effect of systematic parameter dials on chosen variable distributions will allow a robust estimate of systematic uncertainties in modern and future neutrino oscillation experiments such as DUNE. GENIE v3.4.0 http://www.genie-mc.org/ • Clear separation between the distributions of the Empirical and Valencia/ SuSAv2 CC 2p-2h models • Choose uncertainties such that the measurement of the oscillation parameters is not biased in case the wrong model is chosen [1] [1] Cross Section Systematics in DUNE Lars Bathe-Peters lars.bathe-peters@physics.ox.ac.uk Motivation Processes • Problem: Incomplete understanding of neutrino- nucleus scattering processes and nuclear effects • Goal: Obtain interaction model with associated uncertainties • How: Design uncertainty parameters to account for model-to-model discrepancies in the DUNE oscillation analysis Nuclear Eﬀects • Charged-Current inclusive muon neutrino interactions [2] • Initial State Effects: • Fermi Motion • Nuclear Binding Energy • Nucleon-Nucleon-Correlations • Nucleon Correlation Effects: • 1p1h-, 2p2h-(*MEC-)interactions • Final State Interactions (FSIs): • Intranuclear re-scattering • Alteration of final state kinematics • Stimulation of nuclear absorption and emission *MEC: Meson Exchange Current Simulation Idea Conclusion 0.2 − 0.15 − 0.1 − 0.05 − 0 0.05 0.1 0.15 0.2 Bias (GeV) ν Absolute Reco. E 0 2 4 6 8 10 12 14 3 10 × Events/tonne/year CCMEC µ ν Bias, ν Absolute Reco. E Empirical 2p-2h (FSIs on) Valencia 2p-2h (FSIs off) SuSAv2 2p-2h (FSIs on) CCMEC µ ν Bias, ν Absolute Reco. E GENIE v3.4.0, on Ar on) [3,4] In collaboration with: Kirsty Duffy DUNE work in progress Energy Dependence Nucleon Decay Angle • Changes dependence of decay angle of struck nucleon pair (an ad-hoc assumption on angular distribution of outgoing nucleons) away from isotropic distribution • Changes the energy dependence of 2p-2h cross sections 0 1 2 3 4 5 6 (GeV) true ν E 0 2 4 6 8 10 12 3 10 × Events/tonne/year on Ar, CCMEC µ ν True Neutrino Energy, EnergyDependence_CCMEC_1 dial at 1 EnergyDependence_CCMEC_0 dial at 0 on Ar, CCMEC µ ν True Neutrino Energy, DUNE work in progress GENIE v3.4.0, on Ar, SuSAv2 CC 2p-2h 0 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 2 pp θ 1-cos 0 1 2 3 4 5 6 7 3 10 × Events/tonne/year CCMEC µ ν DecayAngMEC, pp-pair, DecayAngMEC dial at 1 DecayAngMEC dial at 0 CCMEC µ ν DecayAngMEC, pp-pair, DUNE work in progress GENIE v3.4.0, on Ar, SuSAv2 CC 2p-2h 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 (GeV) 0 q 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 2 (GeV) 3 q 0 50 100 150 200 250 300 350 400 E t /t / on Ar, CCMEC µ ν , 3 - q 0 q DUNE work in progress SuSAv2 2p-2h GENIE v3.4.0, XSecShape_CCMEC central-value model (SuSAv2 CC 2p-2h) 0.2 0.4 0.6 0.8 1 1.2 1.4 (GeV) 0 q 0.2 0.4 0.6 0.8 1 1.2 1.4 1.6 1.8 2 (GeV) 3 q 0 200 400 600 800 1000 1200 1400 E t /t / on Ar, CCMEC µ ν , 3 - q 0 q DUNE work in progress GENIE