| Full text | |
| Author(s): |
Ramalho, G.
Total Authors: 1
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| Document type: | Journal article |
| Source: | PHYSICAL REVIEW D; v. 97, n. 7, p. 13-pg., 2018-04-11. |
| Abstract | |
We use light-front holography to estimate the valence quark and the meson cloud contributions to the nucleon axial form factor. The free couplings of the holographic model are determined by the empirical data and by the information extracted from lattice QCD. The holographic model provides a good description of the empirical data when we consider a meson cloud mixture of about 30% in the physical nucleon state. The estimate of the valence quark contribution to the nucleon axial form factor compares well with the lattice QCD data for small pion masses. Our estimate of the meson cloud contribution to the nucleon axial form factor has a slower falloff with the square momentum transfer compared to typical estimates from quark models with meson cloud dressing. (AU) | |
| FAPESP's process: | 17/02684-5 - Study of the electromagnetic and axial structure of the baryons in the vacuum and in nuclear medium |
| Grantee: | Gilberto Tomás Ferreira Ramalho |
| Support Opportunities: | Research Grants - Young Investigators Grants |