Journal
PHYSICAL REVIEW LETTERS
Volume 85, Issue 14, Pages 2892-2894Publisher
AMERICAN PHYSICAL SOC
DOI: 10.1103/PhysRevLett.85.2892
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We derive the nonanalytic chiral behavior of the flavor asymmetry (d) over bar - (u) over bar. Such behavior is a unique characteristic of Goldstone boson loops in chiral theories, including QCD, and establishes the unambiguous role played by the Goldstone bosom cloud in the sea of the proton. Generalizing the results to the SU(3) sector, we show that strange chiral loops require that the s - (s) over bar distribution be nonzero.
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