Holographic estimate of the meson cloud contribution to nucleon axial form factor

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.

14 pages, 5 figures. Published version. Extension of the first version

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Cited by in corpus (8)

• Nucleon structure from basis light-front quantization
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• Nucleon axial form factor from generalized parton distributions
• Pion constituent quarks couplings strong form factors: a dynamical approach
• Form factors for pions couplings to constituent quarks under weak magnetic field
• Weak interaction axial form factors of the octet baryons in nuclear medium
• Electroweak form factors of baryons in dense nuclear matter
• Nucleon Structure from Basis Light-Front Quantization : Status and Prospects