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Title: 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 ⟨r2E(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:
ORCiD logo [1]; ORCiD logo [2];  [1];  [1]; ORCiD logo [1]
  1. Univ. of Kentucky, Lexington, KY (United States)
  2. 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) (SC-26)
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
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. doi: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. doi: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 = {2017},
month = {12}
}

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Works referenced in this record:

Scalar densities and baryon mass differences in lattice QCD with Wilson fermions
journal, January 1987


Nucleon electromagnetic form factors from lattice QCD using a nearly physical pion mass
journal, October 2014


Electric and Magnetic Form Factors of the Nucleon
journal, April 1963


Extraction of the proton radius from electron-proton scattering data
journal, July 2015


Continuum limit physics from 2 + 1 flavor domain wall QCD
journal, April 2011


Review of Particle Physics
journal, October 2016


Laser spectroscopy of muonic deuterium
journal, August 2016


Nucleon masses and magnetic moments in a finite volume
journal, August 2004


Model independent extraction of the proton magnetic radius from electron scattering
journal, October 2014


Nucleon charges and electromagnetic form factors from 2 + 1 + 1 -flavor lattice QCD
journal, May 2014


Review of experimental and theoretical status of the proton radius puzzle
journal, January 2017


Proton Structure from the Measurement of 2S-2P Transition Frequencies of Muonic Hydrogen
journal, January 2013


High-precision calculation of the strange nucleon electromagnetic form factors
journal, August 2015


Overlap valence on 2 + 1 flavor domain wall fermion configurations with deflation and low-mode substitution
journal, December 2010


π N and strangeness sigma terms at the physical point with chiral fermions
journal, September 2016


The structure of the nucleon: Elastic electromagnetic form factors
journal, July 2015


The size of the proton
journal, July 2010

  • Pohl, Randolf; Antognini, Aldo; Nez, François
  • Nature, Vol. 466, Issue 7303
  • DOI: 10.1038/nature09250

The proton radius puzzle
journal, May 2015


Finite volume effects on the extraction of form factors at zero momentum
journal, September 2014


Chiral perturbation theory analysis of the baryon magnetic moments
journal, April 1993


Nucleon Structure on a Lattice at the Physical Point
journal, September 2015


Lattice calculation of nucleon isovector axial charge with improved currents
journal, August 2017


XSEDE: Accelerating Scientific Discovery
journal, September 2014

  • Towns, John; Cockerill, Timothy; Dahan, Maytal
  • Computing in Science & Engineering, Vol. 16, Issue 5
  • DOI: 10.1109/MCSE.2014.80

Nucleon form factors with 2 + 1 flavor dynamical domain-wall fermions
journal, June 2009


Proton electromagnetic form factors: Basic notions, present achievements and future perspectives
journal, January 2015


Disconnected quark loop contributions to nucleon observables in lattice QCD
journal, February 2014


Nucleon electromagnetic form factors in twisted mass lattice QCD
journal, May 2011


Strange chiral nucleon form factors
journal, August 1999


Neutral weak form factors of proton and neutron
journal, November 2017


Domain wall QCD with physical quark masses
journal, April 2016


Nucleon electromagnetic form factors in two-flavor QCD
journal, September 2015


Strange Quark Magnetic Moment of the Nucleon at the Physical Point
journal, January 2017


Model-independent extraction of the proton charge radius from electron scattering
journal, December 2010


Lattice results on the connected neutron charge radius
journal, November 2003


Strange magnetism in the nucleon
journal, October 1998


Stochastic method with low mode substitution for nucleon isovector matrix elements
journal, February 2016


Position space method for the nucleon magnetic moment in lattice QCD
journal, October 2016

  • Alexandrou, Constantia; Constantinou, Martha; Koutsou, Giannis
  • Physical Review D, Vol. 94, Issue 7
  • DOI: 10.1103/PhysRevD.94.074508

    Works referencing / citing this record:

    Strange nucleon electromagnetic form factors from lattice QCD
    text, January 2018

    • Alexandrou, C.; Constantinou, M.; Hadjiyiannakou, K.
    • Deutsches Elektronen-Synchrotron, DESY, Hamburg
    • DOI: 10.3204/pubdb-2018-02052