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Direct Evaluation of the Quark Content of Nucleons from Lattice QCD at the Physical Point
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abstract
We evaluate the light, strange and charm scalar content of the nucleon using one lattice QCD ensemble generated with two degenerate light quarks with mass fixed to their physical value. We use improved techniques to evaluate the disconnected quark loops to sufficient accuracy to determine the strange and charm nucleon $\sigma$-terms. in addition to the light quark content $\sigma_{\pi N}$. We find $\sigma_{\pi N}$=$37.2(2.6)(^{4.7}_{2.9})$ MeV $\sigma_{s}$=$41.1(8.2)(^{7.8}_{5.8})$ MeV and $\sigma_c$=$79(21)(^{12}_{\phantom{1}8})$ MeV, where the first error is statistical and the second is the systematic error due to the determination of the lattice spacing, the assessment of finite volume and residual excited state effects.
Forward citations
Cited by 4 Pith papers
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Polarization-dependent mass modifications of $\phi$ meson with finite momentum in nuclear matter
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First-principles lattice QCD decomposes baryon masses into quark sigma terms and a roughly flavor-independent gluon trace anomaly around 1 GeV.
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Nucleon axial, tensor and scalar charges and $\sigma$-terms in lattice QCD
Lattice QCD at physical pion mass with Nf=2+1+1 twisted mass fermions yields g_A^{u-d}=1.286(23), sigma_piN=41.6(3.8) MeV and per-flavor charges including charm.
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Misconceptions About the Physics of the QCD Trace Anomaly from Renormalization in a Reducible Basis
This paper critiques reducible-basis renormalization of the QCD trace anomaly, arguing it introduces unphysical scheme dependence and that the standard whole-anomaly decomposition is the only symmetry-allowed choice.
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