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Theoretical Particle Physics

Publications

Nucleon structure including high Fock states in AdS/QCD

Publicaciones

Nucleon structure including high Fock states in AdS/QCD

Research areas:

Física Teórica de Partículas

Year:

2012

Type of Publication:

In Proceeding

Authors:

  • Alfedo Vega
  • Ivan Schmidt
  • Thomas Gutsche
  • Valery E. Lyubovitskij

Journal:

Phys.Rev.

Volume:

D86

Pages:

22

Abstract:

We present a detailed analysis of nucleon electromagnetic and axial form factors in a holographic soft-wall model. This approach is based on an action which describes hadrons with broken conformal invariance and incorporates confinement through the presence of a background dilaton field.For Nc=3 we describe the nucleon structure in a superposition of a three valence quark state with high Fock states including an adjustable number of partons (quarks, antiquarks and gluons) via studying the dynamics of 5D fermion fields of different scaling dimension in anti-de Sitter (ADS) space. According to the gauge/gravity duality the 5D fermion fields of different scaling dimension correspond to the Fock state components with a specific number of partons. In the present application we restrict to the contribution of 3, 4 and 5 parton components in the nucleon Fock state. With a minimal number of free parameters (dilaton scale parameter, mixing parameters of partial contributions of Fock states, coupling constants in the effective Lagrangian) we achieve a reasonable agreement with data for the nucleon form factors.

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