Uncertainties in the oscillation parameters measurement due to multi-nucleon effects at NO$ν$A Experiment

Abstract

Precise and adequate knowledge of neutrino scattering cross-sections and nuclear effects in them is very important to reduce the systematic uncertainties in neutrino beam oscillation experiments. The insufficiency in our present understanding of these effects inflicts the precision measurements of yet unknown neutrino oscillation parameters and some other experimentally observed anomalies in the neutrino sector. Another source of uncertainty is the energy dependence of neutrino oscillation probability which is a nontrivial function of the true incoming neutrino energy. This energy is reconstructed using different methods, which in turn is used in the analysis leading to the extraction of various neutrino oscillation parameters. The extraction of still unknown parameters like the leptonic CP violation phase demands the precision level in these measurements to be very high. In this work, we use the kinematic method of reconstruction of the incoming neutrino energy, both at the near and far detectors of NOνA (USA) experiment, and investigate the role of multinucleon (MN) effects on the sensitivity measurement of various neutrino oscillation parameters. We use the values of various light neutrino oscillation parameters from their latest global fit values in our analysis.

Nuclear Effects on Oscillation Parameters using Calorimetric method of Neutrino Energy Reconstruction at NO$\nu$A experiment

“…In this paper, we study the multi-nucleon effects due to long-range Random Phase Approximation (RPA) and 2-particle-2-hole (2p-2h) interactions with Transverse Enhancement (TE) [2] in the sensitivity analysis of neutrino oscillation parameters in NOνA. In our recent work we analysed the role of MN without TE using only kinematic method [3]. There are several major processes which produce two (or more) nucleons along with two (or more) holes in the final state -two nucleon correlations in the initial state are referred as the short range correlations (SRC), final state interactions (FSIs) and TE.…”