Abstract
New results on the longitudinal inclusive spin asymmetry A 1 d in the range 1 < Q 2 < 100 (GeV/c)2 and 0.004 < x < 0.7 are presented. From these results we derive the spin-dependent structure function g 1 d which we use to evaluate the scale-invariant flavor-singlet axial Charge â0. The contribution of the measured region is evaluated by a QCD fit of the world data. The data were obtained by the COMPASS experiment at CERN using a 160 GeV polarized muon beam scattered off a large double-cell polarized 6LiD target. The results are in agreement with those from previous experiments and improve considerably the statistical accuracy in the region x < 0.03.
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