Nucleon structure from Lattice QCD using a nearly physical pion mass

J. R. Green; M. Engelhardt; S. Krieg; J. W. Negele; A. V. Pochinsky; S. N. Syritsyn

doi:10.1016/j.physletb.2014.05.075

Nucleon structure from Lattice QCD using a nearly physical pion mass

J. R. Green
, M. Engelhardt
, S. Krieg
, J. W. Negele
, A. V. Pochinsky
, S. N. Syritsyn

Physics and Astronomy

Stony Brook University

Massachusetts Institute of Technology
Johannes Gutenberg University Mainz
New Mexico State University
University of Wuppertal
Jülich Research Centre

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

68 Scopus citations

Abstract

We report the first Lattice QCD calculation using the almost physical pion mass _mπ = 149 MeV that agrees with experiment for four fundamental isovector observables characterizing the gross structure of the nucleon: the Dirac and Pauli radii, the magnetic moment, and the quark momentum fraction. The key to this success is the combination of using a nearly physical pion mass and excluding the contributions of excited states. An analogous calculation of the nucleon axial charge governing beta decay has inconsistencies indicating a source of bias at low pion masses not present for the other observables and yields a result that disagrees with experiment.

Original language	English
Pages (from-to)	290-295
Number of pages	6
Journal	Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume	734
DOIs	https://doi.org/10.1016/j.physletb.2014.05.075
State	Published - Jun 27 2014

Keywords

Form factors
Lattice QCD
Nucleon structure

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10.1016/j.physletb.2014.05.075

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title = "Nucleon structure from Lattice QCD using a nearly physical pion mass",

abstract = "We report the first Lattice QCD calculation using the almost physical pion mass mπ = 149 MeV that agrees with experiment for four fundamental isovector observables characterizing the gross structure of the nucleon: the Dirac and Pauli radii, the magnetic moment, and the quark momentum fraction. The key to this success is the combination of using a nearly physical pion mass and excluding the contributions of excited states. An analogous calculation of the nucleon axial charge governing beta decay has inconsistencies indicating a source of bias at low pion masses not present for the other observables and yields a result that disagrees with experiment.",

keywords = "Form factors, Lattice QCD, Nucleon structure",

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year = "2014",

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doi = "10.1016/j.physletb.2014.05.075",

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journal = "Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics",

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TY - JOUR

T1 - Nucleon structure from Lattice QCD using a nearly physical pion mass

AU - Green, J. R.

AU - Engelhardt, M.

AU - Krieg, S.

AU - Negele, J. W.

AU - Pochinsky, A. V.

AU - Syritsyn, S. N.

PY - 2014/6/27

Y1 - 2014/6/27

N2 - We report the first Lattice QCD calculation using the almost physical pion mass mπ = 149 MeV that agrees with experiment for four fundamental isovector observables characterizing the gross structure of the nucleon: the Dirac and Pauli radii, the magnetic moment, and the quark momentum fraction. The key to this success is the combination of using a nearly physical pion mass and excluding the contributions of excited states. An analogous calculation of the nucleon axial charge governing beta decay has inconsistencies indicating a source of bias at low pion masses not present for the other observables and yields a result that disagrees with experiment.

AB - We report the first Lattice QCD calculation using the almost physical pion mass mπ = 149 MeV that agrees with experiment for four fundamental isovector observables characterizing the gross structure of the nucleon: the Dirac and Pauli radii, the magnetic moment, and the quark momentum fraction. The key to this success is the combination of using a nearly physical pion mass and excluding the contributions of excited states. An analogous calculation of the nucleon axial charge governing beta decay has inconsistencies indicating a source of bias at low pion masses not present for the other observables and yields a result that disagrees with experiment.

KW - Form factors

KW - Lattice QCD

KW - Nucleon structure

UR - https://www.scopus.com/pages/publications/84901821976

U2 - 10.1016/j.physletb.2014.05.075

DO - 10.1016/j.physletb.2014.05.075

M3 - Article

SN - 0370-2693

VL - 734

SP - 290

EP - 295

JO - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

JF - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

ER -

Nucleon structure from Lattice QCD using a nearly physical pion mass

Abstract

Keywords

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