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Title: Analysis of nucleon electromagnetic form factors from light-front holographic QCD: The spacelike region

Journal Article · · Physical Review D
 [1];  [2];  [3];  [4];  [5]
  1. Univ. of Kentucky, Lexington, KY (United States)
  2. Univ. de Costa Rica, San Jose (Costa Rica)
  3. SLAC National Accelerator Lab., Menlo Park, CA (United States)
  4. Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
  5. Institut fur Theoretische Physik der Univ., Heidelberg (Germany)

We present a comprehensive analysis of the space-like nucleon electromagnetic form factors and their flavor decomposition within the framework of light-front holographic QCD. We show that the inclusion of the higher Fock components $$|{qqqq\bar{q}}$$ has a significant effect on the spin-flip elastic Pauli form factor and almost zero effect on the spin-conserving Dirac form factor. We present light-front holographic QCD results for the proton and neutron form factors at any momentum transfer range, including asymptotic predictions, and show that our results agree with the available experimental data with high accuracy. In order to correctly describe the Pauli form factor we need an admixture of a five quark state of about 30$$\%$$ in the proton and about 40$$\%$$ in the neutron. We also extract the nucleon charge and magnetic radii and perform a flavor decomposition of the nucleon electromagnetic form factors. The free parameters needed to describe the experimental nucleon form factors are very few: two parameters for the probabilities of higher Fock states for the spin-flip form factor and a phenomenological parameter $$r$$, required to account for possible SU(6) spin-flavor symmetry breaking effects in the neutron, whereas the Pauli form factors are normalized to the experimental values of the anomalous magnetic moments. As a result, the covariant spin structure for the Dirac and Pauli nucleon form factors prescribed by AdS$$_5$$ semiclassical gravity incorporates the correct twist scaling behavior from hard scattering and also leads to vector dominance at low energy.

Research Organization:
SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC)
Grant/Contract Number:
AC02-76SF00515; DE–AC02–76SF00515; SLAC-PUB–16806; DE–AC05–06OR23177
OSTI ID:
1333524
Alternate ID(s):
OSTI ID: 1338862
Report Number(s):
SLAC-PUB-16806; PRVDAQ; arXiv:1609.06688
Journal Information:
Physical Review D, Vol. 95, Issue 1; ISSN 2470-0010
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 44 works
Citation information provided by
Web of Science

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conference January 1995
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Cited By (19)

Supersymmetric Properties of Hadron Physics from Light-Front Holography and Superconformal Algebra and other Advances in Light-Front QCD journal March 2018
The QCD Running Coupling at All Scales and the Connection Between Hadron Masses and $$\varvec{\varLambda _s}$$ Λ s journal November 2018
The spin structure of the nucleon journal June 2019
Analytic parametrizations of the γ * N N ( 1440 ) form factors inspired by light-front holography journal September 2017
Valence quark contributions for the γ * N N ( 1440 ) form factors from light-front holography journal February 2018
Baryons in a soft-wall AdS-Schwarzschild approach at low temperature journal June 2019
Bjorken polarized sum rule and infrared-safe QCD couplings journal December 2018
Color Confinement, Hadron Dynamics, and Hadron Spectroscopy from Light-Front Holography and Superconformal Algebra journal January 2018
The spin structure of the nucleon journal January 2005
Determination of ${{\rm{\Lambda }}}_{\overline{{\rm{MS}}}}$ at five loops from holographic QCD journal September 2017
Electromagnetic form factors at large momenta from lattice QCD text January 2017
The spin structure of the nucleon journal January 1994
Electromagnetic form factors at large momenta from lattice QCD text January 2017
The Spin Structure of the Nucleon: Proceeding of International School of Nucleon Structure: 1st Course conference April 2017
Color Confinement, Hadron Dynamics, and Hadron Spectroscopy from Light-Front Holography and Superconformal Algebra preprint January 2017
Electromagnetic structure of nucleon and Roper in soft-wall AdS/QCD text January 2017
Universality of Generalized Parton Distributions in Light-Front Holographic QCD text January 2018
Bjorken polarized sum rule and infrared-safe QCD couplings text January 2018
Transition form factors and helicity amplitudes for electroexcitation of negative- and positive parity nucleon resonances in a light-front quark model text January 2019

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