Origin of difference betweenu¯ andd¯ partons in the nucleon
- 21 March 1994
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review Letters
- Vol. 72 (12), 1790-1793
- https://doi.org/10.1103/physrevlett.72.1790
Abstract
Using the Euclidean path-integral formulation for the hadronic tensor, we show that the large difference between u¯ and d¯ does not come from the disconnected quark-loop insertion. Rather, it can come from the connected (quark line) insertion involving quarks propagating backwards in time. We study the influence of the backward time propagator in the axial-vector and scalar matrix elements in lattice gauge calculations and give an estimate of the violation of the Gottfried sum rule.Keywords
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