Flavor decomposition of the polarized quark distributions in the nucleon from inclusive and semi-inclusive deep-inelastic scattering

Abstract Spin asymmetries of semi-inclusive cross sections for the production of positively and negatively charged hadrons have been measured in deep-inelastic scattering of polarized positrons on polarized hydrogen and 3 He targets, in the kinematic range 0.023 (u+ u ) and down ( d+ d ) flavors. The up quark polarization is positive and the down quark polarization is negative in the measured range. The polarization of the sea is compatible with zero. The first moments of the polarized quark distributions are presented. The isospin non-singlet combination Δq3 is consistent with the prediction based on the Bjorken sum rule. The moments of the polarized quark distributions are compared to predictions based on SU(3)f flavor symmetry and to a prediction from lattice QCD.

• Publication year

  1999

• Venue

  Physics Letters B

• Publication date

  1999-06-24

• Fields of study

  Physics

• Identifiers
  DOI 10.1016/S0370-2693(99)00964-8arXiv hep-ex/9906035
• External record

  Open on Semantic Scholar

• Source metadata

  Semantic Scholar

• No claims are published for this paper.

• No concepts are published for this paper.

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