Low-energy elastic (anti)neutrino−nucleon scattering in covariant baryon chiral perturbation theory

Abstract

The low-energy antineutrino- and neutrino−nucleon neutral current elastic scattering is studied within the framework of the relativistic SU(2) baryon chiral perturbation theory up to the order of \mathcal{O}(p^3). We have derived the model-independent hadronic amplitudes and extracted the form factors from them. It is found that differential cross sections \mathrm{d}\sigma /\mathrm{d}{Q}^2 for the processes of (anti)neutrino−proton scattering are in good agreement with the existing MiniBooNE data in the Q^2 region [0.13,0.20] GeV², where nuclear effects are expected to be negligible. For Q^2\le 0.13 GeV², large deviation is observed, which is mainly owing to the sizeable Pauli blocking effect. Comparisons with the simulation data produced by the NuWro and GENIE Mento Carlo events generators are also discussed. The chiral results obtained in this work can be utilized as inputs in various nuclear models to achieve the goal of precise determination of the strangeness axial vector form factor, in particular when the low-energy MicroBooNE data are available in the near future.

Keywords

chiral perturbation theory / neutrino−nucleon scattering / form factors / chiral Lagrangians / one-loop amplitude / neutral weak current

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Declarations

The authors declare that they have no competing interests and there are no conflicts.

Acknowledgements

We would like to thank Prof. M. J. Vicente-Vacas for comments. This work was supported by the National Natural Science Foundation of China (NSFC) (Grant Nos. 12275076, 11905258, 12335002, and 12047503), the Science Fund for Distinguished Young Scholars of Hunan Province under Grant No. 2024JJ2007, and the Fundamental Research Funds for the Central Universities under Contract No. 531118010379. D. L. Y. appreciates the support of Peng Huan-Wu Visiting Professorship and the hospitality of Institute of Theoretical Physics at Chinese Academy of Sciences.

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