Model-independent determination of the axial mass parameter in quasielastic antineutrino-nucleon scattering

Abstract

Understanding the charged current quasielestic (CCQE) neutrino-nucleus interaction is important for precision studies of neutrino oscillations. The theoretical description of the interaction depends on the combination of a nuclear model with the knowledge of form factors. While the former has received considerable attention, the latter, in particular the axial form factor, is implemented using the historical dipole model. Instead, we use a model-independent approach, presented in a previous study, to analyze the muon antineutrino CCQE mineral oil data published by the MiniBooNE collaboration. We combine the cross section for scattering of antineutrinos off protons in carbon and hydrogen, using the same axial form factor for both. The extracted value of the axial mass parameter $m_A=0.84_{-0.04}^{+0.12}\pm 0.11\mathrm{GeV}$ is in very good agreement with the model-independent value extracted from MiniBooNE's neutrino data. Going beyond a one-parameter description of the axial form factor, we extract values of the axial form factor in the range of $Q^2=\mathrm{0.1...1.0}$ GeV${}^2$, finding a very good agreement with the analogous extraction from the neutrino data. We discuss the implications of these results.

13 pages, 3 figures

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• Nucleon form factors on a large volume lattice near the physical point in 2+1 flavor QCD
• Computing the nucleon charge and axial radii directly at $Q^2=0$ in lattice QCD
• The $\pi \gamma \to \pi \pi$ transition and the $\rho$ radiative decay width from lattice QCD
• Review of experimental and theoretical status of the proton radius puzzle
• An accurate evaluation of electron (anti-)neutrino scattering on nucleons
• Cosmic-ray dark matter confronted by constraints on new light mediators
• Nucleon axial form factor from a Bayesian neural-network analysis of neutrino-scattering data
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• Nucleon axial form factor from generalized parton distributions
• $B\to \rho \ell \bar{\nu }$ resonance form factors from $B\to \pi \pi \ell \bar{\nu }$ in lattice QCD
• Contribution of the $a_1$ meson to the axial nucleon-to-$\Delta$ transition form factors
• Model Independent Extraction of the Proton Charge Radius from PRad data
• A Module For Boosted Dark Matter Event Generation in GENIE
• Quasielastic Lepton-Nucleus Scattering and the Correlated Fermi Gas Model