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We present a precise measurement of the deuteron longitudinal spin asymmetry A1d and of the deuteron spin-dependent structure function g1d at Q2<1 (GeV/c)2 and 4×10−5<x<2.5×10−2 based on the data collected by the COMPASS experiment at CERN during the years 2002 and 2003. The statistical precision is tenfold better than that of the previous measurement in this region. The measured A1d and...
We present a measurement of the deuteron spin-dependent structure function g1d based on the data collected by the COMPASS experiment at CERN during the years 2002–2004. The data provide an accurate evaluation for Γ1d, the first moment of g1d(x), and for the matrix element of the singlet axial current, a0. The results of QCD fits in the next to leading order (NLO) on all g1 deep inelastic scattering...
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