Abstract
The flavor asymmetry of the light quark sea of the nucleon is determined in the kinematic range 0.02 < χ < 0.3 and 1 GeV 2 < Q 2 < 10 GeV 2, for the first time from semi-inclusive deep-inelastic scattering. The quantity sol( d(χ) − u(χ)) (u(χ) − d(χ)) 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 non-zero and χ dependent, showing an excess of d over u quarks in the proton.
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