Strange Quark Magnetic Moment of the Nucleon at the Physical Point

Raza Sabbir Sufian; Yi Bo Yang; Andrei Alexandru; Terrence Draper; Jian Liang; Keh Fei Liu

doi:10.1103/PhysRevLett.118.042001

Strange Quark Magnetic Moment of the Nucleon at the Physical Point

Raza Sabbir Sufian
, Yi Bo Yang
, Andrei Alexandru
, Terrence Draper
, Jian Liang
, Keh Fei Liu

Research output: Contribution to journal › Article › peer-review

42 Scopus citations

Abstract

We report a lattice QCD calculation of the strange quark contribution to the nucleon's magnetic moment and charge radius. This analysis presents the first direct determination of strange electromagnetic form factors including at the physical pion mass. We perform a model-independent extraction of the strange magnetic moment and the strange charge radius from the electromagnetic form factors in the momentum transfer range of 0.051 GeV2Q21.31 GeV2. The finite lattice spacing and finite volume corrections are included in a global fit with 24 valence quark masses on four lattices with different lattice spacings, different volumes, and four sea quark masses including one at the physical pion mass. We obtain the strange magnetic moment GMs(0)=-0.064(14)(09)μN. The four-sigma precision in statistics is achieved partly due to low-mode averaging of the quark loop and low-mode substitution to improve the statistics of the nucleon propagator. We also obtain the strange charge radius rs2E=-0.0043(16)(14) fm2.

Original language	English
Article number	042001
Journal	Physical Review Letters
Volume	118
Issue number	4
DOIs	https://doi.org/10.1103/PhysRevLett.118.042001
State	Published - Jan 27 2017

Bibliographical note

Publisher Copyright:
© 2017 American Physical Society.

Funding

This work is supported in part by the U.S. DOE Grant No. DE-SC0013065. This research used resources of the Oak Ridge Leadership Computing Facility at the Oak Ridge National Laboratory, which is supported by the Office of Science of the U.S. Department of Energy under Contract No. DE-AC05-00OR22725. A.A. is supported by the NSF CAREER Grant No. PHY-1151648 and in part by the DOE Grant No. DE-FG02-95ER-40907.

Funders	Funder number
National Science Foundation Office of International Science and Engineering
U.S. Department of Energy Oak Ridge National Laboratory U.S. Department of Energy National Science Foundation National Energy Research Scientific Computing Center	DE-AC05-00OR22725, DE-FG02-95ER-40907, DE-SC0013065
U.S. Department of Energy Chinese Academy of Sciences Guangzhou Municipal Science and Technology Project Oak Ridge National Laboratory Extreme Science and Engineering Discovery Environment National Science Foundation National Energy Research Scientific Computing Center National Natural Science Foundation of China	1151648

ASJC Scopus subject areas

General Physics and Astronomy

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10.1103/PhysRevLett.118.042001

Cite this

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title = "Strange Quark Magnetic Moment of the Nucleon at the Physical Point",

abstract = "We report a lattice QCD calculation of the strange quark contribution to the nucleon's magnetic moment and charge radius. This analysis presents the first direct determination of strange electromagnetic form factors including at the physical pion mass. We perform a model-independent extraction of the strange magnetic moment and the strange charge radius from the electromagnetic form factors in the momentum transfer range of 0.051 GeV2Q21.31 GeV2. The finite lattice spacing and finite volume corrections are included in a global fit with 24 valence quark masses on four lattices with different lattice spacings, different volumes, and four sea quark masses including one at the physical pion mass. We obtain the strange magnetic moment GMs(0)=-0.064(14)(09)μN. The four-sigma precision in statistics is achieved partly due to low-mode averaging of the quark loop and low-mode substitution to improve the statistics of the nucleon propagator. We also obtain the strange charge radius rs2E=-0.0043(16)(14) fm2.",

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AU - Sufian, Raza Sabbir

AU - Yang, Yi Bo

AU - Alexandru, Andrei

AU - Draper, Terrence

AU - Liang, Jian

AU - Liu, Keh Fei

PY - 2017/1/27

Y1 - 2017/1/27

N2 - We report a lattice QCD calculation of the strange quark contribution to the nucleon's magnetic moment and charge radius. This analysis presents the first direct determination of strange electromagnetic form factors including at the physical pion mass. We perform a model-independent extraction of the strange magnetic moment and the strange charge radius from the electromagnetic form factors in the momentum transfer range of 0.051 GeV2Q21.31 GeV2. The finite lattice spacing and finite volume corrections are included in a global fit with 24 valence quark masses on four lattices with different lattice spacings, different volumes, and four sea quark masses including one at the physical pion mass. We obtain the strange magnetic moment GMs(0)=-0.064(14)(09)μN. The four-sigma precision in statistics is achieved partly due to low-mode averaging of the quark loop and low-mode substitution to improve the statistics of the nucleon propagator. We also obtain the strange charge radius rs2E=-0.0043(16)(14) fm2.

AB - We report a lattice QCD calculation of the strange quark contribution to the nucleon's magnetic moment and charge radius. This analysis presents the first direct determination of strange electromagnetic form factors including at the physical pion mass. We perform a model-independent extraction of the strange magnetic moment and the strange charge radius from the electromagnetic form factors in the momentum transfer range of 0.051 GeV2Q21.31 GeV2. The finite lattice spacing and finite volume corrections are included in a global fit with 24 valence quark masses on four lattices with different lattice spacings, different volumes, and four sea quark masses including one at the physical pion mass. We obtain the strange magnetic moment GMs(0)=-0.064(14)(09)μN. The four-sigma precision in statistics is achieved partly due to low-mode averaging of the quark loop and low-mode substitution to improve the statistics of the nucleon propagator. We also obtain the strange charge radius rs2E=-0.0043(16)(14) fm2.

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Strange Quark Magnetic Moment of the Nucleon at the Physical Point

Abstract

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