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Exploring Meson Exchange Currents (MEC) Impact on Neutrino Energy Reconstruction with NuWro

This study presents introductory plots derived from the NuWro neutrino generator focusing on Meson Exchange Currents (MEC) applicable to neutrino interactions. We analyze effects from QE-like interactions involving multiple nucleons at the primary vertex, exploring discrepancies in fitted parameters for quasielastic (QE) measurements across different experimental setups. The work addresses systemic uncertainties in energy reconstruction and investigates the potential of ND280 to detect MEC. Our findings are based on generating 200,000 events, revealing vital insights into neutrino interactions and energy dynamics.

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Exploring Meson Exchange Currents (MEC) Impact on Neutrino Energy Reconstruction with NuWro

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  1. MEC – a few introductory plots from NuWro

  2. Meson Exchange Current models • Now available in NuWro neutrino generator (in TEM and Martini-Marteau MEC flavors) • QE-like interactions with more than one nucleon at the primary vertex • Possible explanation for differences in fitted parameters (MA) for measurements of quasielastic (QE) interactions between old (bubble chamber) and new (Miniboone, etc.) experiments • Their existence can contribute to systematic errors in neutrino energy reconstruction • Two separate problems: • What is their impact on neutrino energy reconstruction? • Can we detect MEC by means of ND280?

  3. MEC & NuWro • Nuwro version: 11j • 200.000 events generated • T2K muon flux, carbon target • Simulated channels: QE, MEC, RES, DIS, COH • MEC: Martini-Marteau • The cascade (FSI) is turned on, so MEC do not have to necessarily have two protons in the final state!

  4. all: how many MEC? CCQE True neutrino energy [MeV]

  5. CCQE like: how many MEC? Simple CCQE like: at least one muon, no charged pions with momentum above 200 MeV/c

  6. Relative contribution: true CCQE vs true CCMEC CCMEC/(CCQE+CCMEC) as a function of neutrino energy

  7. How to detect MECs - #protons • I have selected events with a muon and no charged pions above 200MeV/c in momentum • Let's see how many protons MECs and others have! Mean sig: 1.80 Mean bg: 1.23

  8. How to detect MECs – #protons with p>350MeV/c Mean sig: 1.27 Mean bg: 0.88

  9. How to detect MECs – #protons with p>450MeV/c Mean sig: 0.93 Mean bg: 0.68

  10. How to detect MECs – proton kinetic energy • The same cuts, but we plot sum of all protons' kinetic energy (in principle it is observable in the detector as deposited energy) Mean sig: 275 Mean bg: 207 Ek, [MeV]

  11. What is the MEC's impact on energy reconstruction?

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