Flavor Asymmetry of the Light Quark Sea from Semi-inclusive Deep-Inelastic Scattering

Abstract
The flavor asymmetry of the light quark sea of the nucleon is determined in the kinematic range 0.02<x<0.3 and 1<Q2<10GeV2 for the first time from semi-inclusive deep-inelastic scattering. The quantity [d¯(x)u¯(x)]/[u(x)d(x)] is derived from a relationship between the yields of positive and negative pions from unpolarized hydrogen and deuterium targets. The flavor asymmetry d¯u¯ is found to be nonzero and x dependent, showing an excess of d¯ over u¯ quarks in the proton.

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