Axial form-factor and induced pseudoscalar form-factor of the nucleons
Department of Physics, North China Electric Power University, Baoding, 071003, P.R. China
2 Department of Modern Physics, University of Science and Technology of China, Hefei, 230026, P.R. China
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Revised: 6 April 2006
Published online: 19 May 2006
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.
© Springer-Verlag, 2006