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Axial form-factor and induced pseudoscalar form-factor of the nucleons

  • Theoretical Physics
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Abstract

We calculate the axial and the induced pseudoscalar form-factors GA(t=-Q2) and GP(t=-Q2) of the nucleons in the framework of the light-cone QCD sum-rules approach up to twist-6 three valence quark light-cone distribution amplitudes, and observe that the form-factors GA(t=-Q2) and GP(t=-Q2) at intermediate and large momentum transfers with Q2>2 GeV2 have significant contributions from the end-point (soft) terms. The numerical values for the axial form-factor GA(t=-Q2) are compatible with the experimental data and theoretical calculations; for example, the chiral quark models and lattice QCD. The numerical values for the induced pseudoscalar form-factor GP(t=-Q2) are compatible with the calculation from the Bethe–Salpeter equation.

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Authors and Affiliations

  1. Department of Physics, North China Electric Power University, Baoding, 071003, P.R. China

    Z.-G. Wang

  2. Department of Modern Physics, University of Science and Technology of China, Hefei, 230026, P.R. China

    S.-L. Wan & W.-M. Yang

Authors
  1. Z.-G. Wang
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  2. S.-L. Wan
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  3. W.-M. Yang
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Correspondence to Z.-G. Wang.

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PACS

12.38.Aw; 12.38.-t; 14.20.Dh

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Wang, ZG., Wan, SL. & Yang, WM. Axial form-factor and induced pseudoscalar form-factor of the nucleons. Eur. Phys. J. C 47, 375–384 (2006). https://doi.org/10.1140/epjc/s2006-02570-2

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  • DOI: https://doi.org/10.1140/epjc/s2006-02570-2

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