Sea quarks contribution to the nucleon magnetic moment and charge radius at the physical point

Sufian, Raza Sabbir; Yang, Yi-Bo; Liang, Jian; Draper, Terrence; Liu, Keh-Fei

doi:10.1103/PhysRevD.96.114504

Sea quarks contribution to the nucleon magnetic moment and charge radius at the physical point

Journal Article · Thu Dec 07 00:00:00 EST 2017 · Physical Review D

DOI:https://doi.org/10.1103/PhysRevD.96.114504· OSTI ID:1595985

^[1]; ^[2]; Liang, Jian ^[3]; Draper, Terrence ^[3]; ^[3]

Univ. of Kentucky, Lexington, KY (United States); University of Kentucky
Univ. of Kentucky, Lexington, KY (United States); Michigan State Univ., East Lansing, MI (United States)
Univ. of Kentucky, Lexington, KY (United States)

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 μ_M(DI) = –0.022(11)(09)μ_N 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.

View Accepted Manuscript (DOE)

Research Organization:: Univ. of Kentucky, Lexington, KY (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26)

Contributing Organization:: χQCD Collaboration

Grant/Contract Number:: AC05-00OR22725; SC0013065

OSTI ID:: 1595985

Alternate ID(s):: OSTI ID: 1411982
OSTI ID: 1541132

Report Number(s):: DOE-UKY--13065-1705.05849; arXiv:1705.05849; MSUHEP-17-005

Journal Information:: Physical Review D, Journal Name: Physical Review D Journal Issue: 11 Vol. 96; ISSN PRVDAQ; ISSN 2470-0010

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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