Flavor structure of the nucleon sea from lattice QCD

By Huey-Wen Lin, Jiunn-Wei Chen, Saul D. Cohen, X. Ji. 2014

171 citations recorded by the source corpus.

We present the first direct lattice calculation of the isovector sea-quark distributions in the nucleon within the framework of the large-momentum effective field theory proposed recently. We use N f = 2 + 1 + 1 highly improved staggered quarks lattice gauge ensembles (generated by the MILC Collaboration) and clover valence fermions with pion mass 310 MeV. We establish the convergence of the result as the nucleon momentum increases within the uncertainty of the calculation. Although the lattice systematics are not yet fully under control, we obtain some qualitative features of the flavor structure of the nucleon sea: d ¯ ( x ) > u ¯ ( x ) leading to the violation of the Gottfried sum rule, Δ u ¯ ( x ) > Δ d ¯ ( x ) as indicated by the STAR data at large and small leptonic pseudorapidity.

Subfields: Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/44ab28cae5718fd2c7798e21b51b6bb163a14b6a

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In Nuclear and High Energy Physics

Citations in the corpus

A Guide to Light-Cone PDFs from Lattice QCD: An Overview of Approaches, Techniques, and Results (2018, background): “As a consequence, the first studies of quasi-PDFs on the lattice were either neglecting renormalization [46] or multiplying naively the matrix elements with the renormalization function of the corresponding local operators [100, 107, 108], a procedure understood as normalization.”
Parton distributions and lattice-QCD calculations: Toward 3D structure (2020, background): “PDFs at the physical point with quasi-distributions Pioneering works have shown great promise in obtaining quantitative results for the unpolarized, helicity and transversity quark and antiquark distributions (Alexandrou et al., 2014, 2015; Chen et al., 2016; Lin, 2014a,b; Lin et al., 2015).”
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Nucleon-nucleon correlations, short-lived excitations, and the quarks within (2016, background): “Lattice calculations (Ji, 2013; Lin et al., 2015) and the DysonSchwinger approach (Cloet and Roberts, 2014) are making progress on computing free-nucleon parton distributions.”
Lattice calculation of parton distributions (2015, unknown): “[7], the authors applied HYP smearing [26] to the gauge links in the”
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