Two-component model for the axial form factor of the nucleon

Details Two-component model for the axial form factor of the nucleon Two-component model for the axial form factor of the nucleon

2007-06-24

arxiv.org/abs/0706.3509v3

Phys.Rev.C78:035201,2008

Physics

Nuclear Physics

Nuclear Theory

12 pages 2 figures Final version to appear in Phys. Rev. C

Scientific paper

10.1103/PhysRevC.78.035201

The axial form factor of the nucleon is studied in a two-component model consisting of a three-quark intrinsic structure surrounded by a meson cloud. The experimental data in the space-like region are well reproduced with a minimal number of parameters. The results are similar to those obtained from a dipole fit up to 1 GeV$^2$, but they surprisingly show a zero between 2 and 3 GeV$^2$. Such behavior, predicted by the present model completely disagrees with the dipole parametrization. The theoretical expression for the form factor is then analytically extrapolated to the time-like region, giving the first predictions in this regime. This kinematical region is especially interesting for present and future colliders.

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