Sea quarks contribution to the nucleon magnetic moment and charge radius at the physical point
Abstract
We report a comprehensive analysis of the light and strange disconnected-sea quarks contribution to the nucleon magnetic moment, charge radius, and the electric and magnetic form factors. The lattice QCD calculation includes ensembles across several lattice volumes and lattice spacings with one of the ensembles at the physical pion mass. We adopt a model-independent extrapolation of the nucleon magnetic moment and the charge radius. We have performed a simultaneous chiral, infinite volume, and continuum extrapolation in a global fit to calculate results in the continuum limit. We find that the combined light and strange disconnected-sea quarks contribution to the nucleon magnetic moment is μM(DI) = –0.022(11)(09)μN and to the nucleon mean square charge radius is ⟨r2⟩E(DI) = –0.019 (05)(05) fm2 which is about 1/3 of the difference between the ⟨r$$^{2}_{p}$$⟩E of electron-proton scattering and that of a muonic atom and so cannot be ignored in obtaining the proton charge radius in the lattice QCD calculation. Here, the most important outcome of this lattice QCD calculation is that while the combined light-sea and strange quarks contribution to the nucleon magnetic moment is small at about 1%, a negative 2.5(9)% contribution to the proton mean square charge radius and a relatively larger positive 16.3(6.1)% contribution to the neutron mean square charge radius come from the sea quarks in the nucleon. For the first time, by performing global fits, we also give predictions of the light and strange disconnected-sea quarks contributions to the nucleon electric and magnetic form factors at the physical point and in the continuum and infinite volume limits in the momentum transfer range of 0 ≤ Q2 ≤ 0.5 GeV2.
- Authors:
-
[1];
[2];
[1]
- Univ. of Kentucky, Lexington, KY (United States)
- Univ. of Kentucky, Lexington, KY (United States); Michigan State Univ., East Lansing, MI (United States)
- Publication Date:
- Research Org.:
- Univ. of Kentucky, Lexington, KY (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Nuclear Physics (NP)
- Contributing Org.:
- χQCD Collaboration
- OSTI Identifier:
- 1595985
- Alternate Identifier(s):
- OSTI ID: 1411982
- Report Number(s):
- DOE-UKY-13065-1705.05849
Journal ID: ISSN 2470-0010; PRVDAQ; arXiv:1705.05849; MSUHEP-17-005; TRN: US2101602
- Grant/Contract Number:
- SC0013065; AC05-00OR22725
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Physical Review D
- Additional Journal Information:
- Journal Volume: 96; Journal Issue: 11; Journal ID: ISSN 2470-0010
- Publisher:
- American Physical Society (APS)
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 73 NUCLEAR PHYSICS AND RADIATION PHYSICS; 72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; Form factors; Lattice QCD; Nuclear charge distribution; Nuclear structure & decays
Citation Formats
Sufian, Raza Sabbir, Yang, Yi-Bo, Liang, Jian, Draper, Terrence, and Liu, Keh-Fei. Sea quarks contribution to the nucleon magnetic moment and charge radius at the physical point. United States: N. p., 2017.
Web. doi:10.1103/PhysRevD.96.114504.
Sufian, Raza Sabbir, Yang, Yi-Bo, Liang, Jian, Draper, Terrence, & Liu, Keh-Fei. Sea quarks contribution to the nucleon magnetic moment and charge radius at the physical point. United States. https://doi.org/10.1103/PhysRevD.96.114504
Sufian, Raza Sabbir, Yang, Yi-Bo, Liang, Jian, Draper, Terrence, and Liu, Keh-Fei. Thu .
"Sea quarks contribution to the nucleon magnetic moment and charge radius at the physical point". United States. https://doi.org/10.1103/PhysRevD.96.114504. https://www.osti.gov/servlets/purl/1595985.
@article{osti_1595985,
title = {Sea quarks contribution to the nucleon magnetic moment and charge radius at the physical point},
author = {Sufian, Raza Sabbir and Yang, Yi-Bo and Liang, Jian and Draper, Terrence and Liu, Keh-Fei},
abstractNote = {We report a comprehensive analysis of the light and strange disconnected-sea quarks contribution to the nucleon magnetic moment, charge radius, and the electric and magnetic form factors. The lattice QCD calculation includes ensembles across several lattice volumes and lattice spacings with one of the ensembles at the physical pion mass. We adopt a model-independent extrapolation of the nucleon magnetic moment and the charge radius. We have performed a simultaneous chiral, infinite volume, and continuum extrapolation in a global fit to calculate results in the continuum limit. We find that the combined light and strange disconnected-sea quarks contribution to the nucleon magnetic moment is μM(DI) = –0.022(11)(09)μN and to the nucleon mean square charge radius is ⟨r2⟩E(DI) = –0.019 (05)(05) fm2 which is about 1/3 of the difference between the ⟨r$^{2}_{p}$⟩E of electron-proton scattering and that of a muonic atom and so cannot be ignored in obtaining the proton charge radius in the lattice QCD calculation. Here, the most important outcome of this lattice QCD calculation is that while the combined light-sea and strange quarks contribution to the nucleon magnetic moment is small at about 1%, a negative 2.5(9)% contribution to the proton mean square charge radius and a relatively larger positive 16.3(6.1)% contribution to the neutron mean square charge radius come from the sea quarks in the nucleon. For the first time, by performing global fits, we also give predictions of the light and strange disconnected-sea quarks contributions to the nucleon electric and magnetic form factors at the physical point and in the continuum and infinite volume limits in the momentum transfer range of 0 ≤ Q2 ≤ 0.5 GeV2.},
doi = {10.1103/PhysRevD.96.114504},
journal = {Physical Review D},
number = 11,
volume = 96,
place = {United States},
year = {Thu Dec 07 00:00:00 EST 2017},
month = {Thu Dec 07 00:00:00 EST 2017}
}
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