Analysis of nucleon electromagnetic form factors from light-front holographic QCD: The spacelike region
Abstract
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.
- Authors:
-
- Univ. of Kentucky, Lexington, KY (United States)
- Univ. de Costa Rica, San Jose (Costa Rica)
- SLAC National Accelerator Lab., Menlo Park, CA (United States)
- Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
- Institut fur Theoretische Physik der Univ., Heidelberg (Germany)
- Publication Date:
- Research Org.:
- SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC)
- OSTI Identifier:
- 1333524
- Alternate Identifier(s):
- OSTI ID: 1338862
- Report Number(s):
- SLAC-PUB-16806
Journal ID: ISSN 2470-0010; PRVDAQ; arXiv:1609.06688
- Grant/Contract Number:
- AC02-76SF00515; DE–AC02–76SF00515; SLAC-PUB–16806; DE–AC05–06OR23177
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physical Review D
- Additional Journal Information:
- Journal Volume: 95; Journal Issue: 1; Journal ID: ISSN 2470-0010
- Publisher:
- American Physical Society (APS)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; lattice; theory-nucl; phenomenology-HEP; HEPPH
Citation Formats
Sufian, Raza Sabbir, de Teramond, Guy F., Brodsky, Stanley J., Deur, Alexandre, and Dosch, Hans Gunter. Analysis of nucleon electromagnetic form factors from light-front holographic QCD: The spacelike region. United States: N. p., 2017.
Web. doi:10.1103/PhysRevD.95.014011.
Sufian, Raza Sabbir, de Teramond, Guy F., Brodsky, Stanley J., Deur, Alexandre, & Dosch, Hans Gunter. Analysis of nucleon electromagnetic form factors from light-front holographic QCD: The spacelike region. United States. https://doi.org/10.1103/PhysRevD.95.014011
Sufian, Raza Sabbir, de Teramond, Guy F., Brodsky, Stanley J., Deur, Alexandre, and Dosch, Hans Gunter. Tue .
"Analysis of nucleon electromagnetic form factors from light-front holographic QCD: The spacelike region". United States. https://doi.org/10.1103/PhysRevD.95.014011. https://www.osti.gov/servlets/purl/1333524.
@article{osti_1333524,
title = {Analysis of nucleon electromagnetic form factors from light-front holographic QCD: The spacelike region},
author = {Sufian, Raza Sabbir and de Teramond, Guy F. and Brodsky, Stanley J. and Deur, Alexandre and Dosch, Hans Gunter},
abstractNote = {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.},
doi = {10.1103/PhysRevD.95.014011},
journal = {Physical Review D},
number = 1,
volume = 95,
place = {United States},
year = {Tue Jan 10 00:00:00 EST 2017},
month = {Tue Jan 10 00:00:00 EST 2017}
}
Web of Science
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