Spin structure function of deuteron g1d from COMPASS
Abstract.New results on the longitudinal inclusive spin asymmetry A1d in the range 1 < Q2 < 100(GeV/c)^2 and 0.004 < x < 0.7 are presented. From these results we derive the spin-dependent structure function g1d which we use to evaluate the scale-invariant flavor-singlet axial charge $ \hat{{a}}_{0}^{}$. 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 160GeV 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.