Data-based two-body current contribution to the neutrino-nucleus cross section

Abstract

A phenomenological model of two-body current (2p2h) contribution to neutrino cross section is introduced. Predictions of the Valencia model for 2p2h [J. Nieves et al., Phys. Rev. C 83, 045501 (2011)] are modified using recent CC0π measurements from T2K and MINERvA experiments. Our results suggest a significant increase of the 2p2h cross section at neutrino energies bigger than 1 GeV and also a redistribution of 2p2h events as function of energy and momentum transfer. This may have a big impact on neutrino energy reconstruction in neutrino oscillation parameters.

Event Generators for High-Energy Physics Experiments

“…In this scheme, any simulated event is a two-step process with an initial (hard) neutrino scattering off a bound nucleon (or a pair of nucleons) followed by final-state interactions (FSI) of knocked-out nucleons, hyperons and produced pions. Together with various supplemental nuclear effects, this simple picture can reproduce many experimental results for both inclusive [1060][1061][1062] and exclusive [969,1063,1064] cross sections measurements.…”

“…A novelty is an option of using the phenomenological 2p2h model of Ref. [1062], which is tuned to reproduce the inclusive T2K and MINERvA CC0π cross section data. As for the hadronic part, NuWro uses a model proposed in Ref.…”

Running axial mass of the nucleon as a phenomenological tool for calculating quasielastic neutrino–nucleus cross sections

“…5.2.2 and also Ref. [199] where similar problem is discussed). Moreover, owing to strong correlations the standard χ 2 values for the T2K C 8 H 8 and MINERνA data may sometimes look counterintuitive.…”

“…For more details, see Table 7 zle [214] (see Ref. [199] for a possible remedy to deal with this problem). Recall that the SM RFG + M run A models and G18 tunes satisfactory describe the T2K data on water target exposed to the same ν μ beam.…”

Study of final-state interactions of protons in neutrino-nucleus scattering with INCL and NuWro cascade models

“…Depending on the energy transferred from the interacting leptonic probe to the hadronic system, NuWro provides quasielastic [23], hyperon production [24], single-pion production and more inelastic channels (DIS) [25] for scattering off free nucleons. After including complex nuclear targets, additional channels such as two-body processes [26], coherent pion production [27], and neutrino scattering off atomic electrons [28] are included. The framework utilizes various nuclear models to provide predictions for the dynamics of target nucleons (e.g., global or local Fermi gas, spectral functions [29,30], or a momentumdependent nuclear potential [23]).…”