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

作者：Wang Z G^*; Wan S L; Yang W M

来源：European Physical Journal C, 2006, 47(2): 375-384.

DOI：10.1140/epjc/s2006-02570-2

We calculate the axial and the induced pseudoscalar form-factors G(A) (t = -Q(2)) and Gp(t = -Q(2)) 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 G(A)(t = -Q(2)) and Gp(t = -Q(2)) at intermediate and large momentum transfers with Q(2) > 2 GeV2 have significant contributions from the endpoint (soft) terms. The numerical values for the axial form-factor G(A)(t = -Q(2)) 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 G(p) (t = -Q(2)) are compatible with the calculation from the Bethe-Salpeter equation.

• 出版日期2006-8
• 单位华北电力大学