Physics – Nuclear Physics – Nuclear Experiment
Scientific paper
2003-08-13
Phys.Rev.Lett.92:012004,2004
Physics
Nuclear Physics
Nuclear Experiment
5 pages, 2 figures, this is the final version appeared in Phys. Rev. Lett
Scientific paper
10.1103/PhysRevLett.92.012004
We have measured the neutron spin asymmetry $A_1^n$ 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 $A_1^n$ 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.
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