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arXiv 1311.3754hep-phnucl-th
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从MiniBooNE数据确定轴向核子形状因子

Determination of the axial nucleon form factor from the MiniBooNE data

A. V. Butkevich, D. Perevalov

摘要:

本文研究了中微子和反中微子在碳靶上的荷电准弹性散射,研究了核效应对轴向形状因子F_A(Q^2)的影响。本文提出了一种从通量积分$dσ/dQ^2$截面中提取F_A(Q^2)的方法。从MiniBooNE实验的数据进行了分析,在相对论扭曲波脉冲近似,费米气体模型,并在费米气体模型与增强的横向截面。我们发现在冲量近似下提取的轴向形状因子的值与在轴向质量MA ~1.37 GeV时由偶极子近似预测的值吻合得很好。另一方面,在横向增强近似下,F_A的Q^2依赖性与偶极子近似有很大的不同。

英文摘要:

Both neutrino and antineutrino charged-current quasi-elastic scattering on a carbon target are studied to investigate the nuclear effect on the determination of the axial form factor F_A(Q^2). A method for extraction of F_A(Q^2) from the flux-integrated $dσ/dQ^2$ cross section of (anti)neutrino scattering on nuclei is presented. Data from the MiniBooNE experiment are analyzed in the relativistic distorted-wave impulse approximation, Fermi gas model, and in the Fermi gas model with enhancements in the transverse cross section. We found that the values of the axial form factor, extracted in the impulse approximation and predicted by the dipole approximation with the axial mass M_A~1.37 GeV are in good agreement. On the other hand, the Q^2-dependence of F_A extracted in the approach with the transverse enhancement is found to differ significantly from the dipole approximation.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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