The Deuteron Spin-dependent Structure Function g1d and its First Moment

Details The Deuteron Spin-dependent Structure Function g1d and its First Moment The Deuteron Spin-dependent Structure Function g1d and its First Moment

2006-09-21

arxiv.org/abs/hep-ex/0609038v2

Phys.Lett.B647:8-17,2007

Physics

High Energy Physics

High Energy Physics - Experiment

fits redone using MRST2004 instead of MRSV1998 for G(x), correlation matrix added

Scientific paper

10.1016/j.physletb.2006.12.076

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 Gamma_1^d, 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 data are also presented. They provide two solutions with the gluon spin distribution function Delta G positive or negative, which describe the data equally well. In both cases, at Q^2 = 3 (GeV/c)^2 the first moment of Delta G is found to be of the order of 0.2 - 0.3 in absolute value.

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