Consistent analysis of neutral- and charged-current neutrino scattering off carbon

TL;DR

This paper uses a spectral function approach to analyze neutrino scattering off carbon, aiming to resolve discrepancies in cross section measurements across different experiments and energies.

Contribution

It provides a unified analysis of neutral- and charged-current neutrino scattering on carbon, incorporating nuclear effects and multi-nucleon states with a fixed axial mass, aligning results across multiple datasets.

Findings

Nuclear effects in NCE and CCQE are similar.

Axial mass from MiniBooNE shape analysis agrees with BNL E734 and NOMAD.

Multi-nucleon contributions are insufficient to explain MiniBooNE normalization.

Abstract

Background: Good understanding of the cross sections for (anti)neutrino scattering off nuclear targets in the few-GeV energy region is a prerequisite for correct interpretation of results of ongoing and planned oscillation experiments. Purpose: Clarify possible source of disagreement between recent measurements of the cross sections on carbon. Method: Nuclear effects in (anti)neutrino scattering off carbon nucleus are described using the spectral function approach. The effect of two- and multi-nucleon final states is accounted for by applying an effective value of the axial mass, fixed to 1.23 GeV. Neutral-current elastic (NCE) and charged-current quasielastic (CCQE) processes are treated on equal footing. Results: The differential and total cross sections for the energy ranging from a few hundreds of MeV to 100 GeV are obtained and compared to the available data from the BNL E734, MiniBooNE, and NOMAD experiments. Conclusions: Nuclear effects in NCE and CCQE scattering seem to be very similar. Within the spectral function approach, the axial mass from the shape analysis of the MiniBooNE data is in good agreement with the results reported by the BNL E734 and NOMAD Collaborations. However, the combined analysis of NCE and CCQE data does not seem to support the contribution of multi-nucleon final states being large enough to explain the normalization of the MiniBooNE-reported cross sections.