Title

Precision measurement of the neutron spin asymmetry A(1)(n) and spin-flavor decomposition in the valence quark region

Publication Date

2004

Journal or Book Title

PHYSICAL REVIEW LETTERS

Abstract

We have measured the neutron spin asymmetry A(n)(1) with high precision at three kinematics in the deep inelastic region at x=0.33, 0.47, and 0.60, and Q(2)=2.7, 3.5, and 4.8 (GeV/c)(2), respectively. Our results unambiguously show, for the first time, that A(n)(1) crosses zero around x=0.47 and becomes significantly positive at x=0.60. Combined with the world proton data, polarized quark distributions were extracted. Our results, in general, agree with relativistic constituent quark models and with perturbative quantum chromodynamics (PQCD) analyses based on the earlier data. However they deviate from PQCD predictions based on hadron helicity conservation.

DOI

10.1103/PhysRevLett.92.012004

Volume

92

Issue

1

Pages

-

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