Lattice Computation of the Nucleon Scalar Quark Contents at the Physical Point

Budapest-Marseille-Wuppertal Collaboration

Research output: Contribution to journalArticle

63 Citations (Scopus)

Abstract

We present a QCD calculation of the u, d, and s scalar quark contents of nucleons based on 47 lattice ensembles with Nf=2+1 dynamical sea quarks, 5 lattice spacings down to 0.054 fm, lattice sizes up to 6 fm, and pion masses down to 120 MeV. Using the Feynman-Hellmann theorem, we obtain fudN=0.0405(40)(35) and fsN=0.113(45)(40), which translates into σπN=38(3)(3) MeV, σsN=105(41)(37) MeV, and yN=0.20(8)(8) for the sigma terms and the related ratio, where the first errors are statistical and the second errors are systematic. Using isospin relations, we also compute the individual up and down quark contents of the proton and neutron (results in the main text).

Original languageEnglish
Article number172001
JournalPhysical Review Letters
Volume116
Issue number17
DOIs
Publication statusPublished - Apr 28 2016

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quarks
scalars
Hellmann-Feynman theorem
nucleons
systematic errors
pions
quantum chromodynamics
spacing
neutrons
protons

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Lattice Computation of the Nucleon Scalar Quark Contents at the Physical Point. / Budapest-Marseille-Wuppertal Collaboration.

In: Physical Review Letters, Vol. 116, No. 17, 172001, 28.04.2016.

Research output: Contribution to journalArticle

Budapest-Marseille-Wuppertal Collaboration. / Lattice Computation of the Nucleon Scalar Quark Contents at the Physical Point. In: Physical Review Letters. 2016 ; Vol. 116, No. 17.
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AU - Krieg, S.

AU - Lellouch, L.

AU - Lippert, T.

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