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

Abstract

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.

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

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• Measurements of the Proton and Deuteron Spin Structure Functions g1 and g2
• Precision Determination of the Neutron Spin Structure Function g1n
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• Physical Gluons and High $E_T$ Jets
• Measurement of the Deuteron Spin Structure Function g_1^d(x) for 1 (GeV/c)^2 < Q^2 < 40 (GeV/c)^2
• Precision Measurement of the Proton and Deuteron Spin Structure Functions g2 and Asymmetries A2
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• Precision Measurement of the Neutron Spin Asymmetry $A_1^n$ and Spin-Flavor Decomposition in the Valence Quark Region
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• First Measurement of the Tensor Structure Function $b_1$ of the Deuteron
• The (alpha_s)^3 approximation of Quantum Chromodynamics to the Ellis-Jaffe sum rule
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• Can the polarization of the strange quarks in the proton be positive ?
• NLO QCD procedure of the semi-inclusive deep inelastic scattering data analysis with respect to the light quark polarized sea
• A Monte Carlo for POLarized (semi-inclusive) Deep Inelastic Scattering

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