Spin asymmetry A1d and the spin-dependent structure function g1d of the deuteron at low values of x and Q2
Abstract
We present a precise measurement of the deuteron longitudinal spin asymmetry A1d and of the deuteron spin-dependent structure function g1d at Q2 < 1 GeV2 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 g1d are found to be consistent with zero in the whole range of x.
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