The deuteron spin-dependent structure function g1d and its first moment

By The Compass Collaboration, V. Alexakhin, et al. 2006

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Abstract We present a measurement of the deuteron spin-dependent structure function g 1 d based on the data collected by the COMPASS experiment at CERN during the years 2002–2004. The data provide an accurate evaluation for Γ 1 d , the first moment of g 1 d ( x ) , and for the matrix element of the singlet axial current, a 0 . The results of QCD fits in the next to leading order (NLO) on all g 1 deep inelastic scattering data are also presented. They provide two solutions with the gluon spin distribution function ΔG positive or negative, which describe the data equally well. In both cases, at Q 2 = 3 ( GeV / c ) 2 the first moment of Δ G ( x ) is found to be of the order of 0.2–0.3 in absolute value.

Subfields: Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/59e0c435913e163ee3311e864a17a4474335ca8f