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Spin structure function of deuteron g1 d from COMPASS

Abstract.

New results on the longitudinal inclusive spin asymmetry A 1 d in the range 1 < Q 2 < 100(GeV/c)^2 and 0.004 < x < 0.7 are presented. From these results we derive the spin-dependent structure function g 1 d which we use to evaluate the scale-invariant flavor-singlet axial charge \( \hat{{a}}_{0}^{}\). The contribution of the measured region is evaluated by a QCD fit of the world data. The data were obtained by the COMPASS experiment at CERN using a 160GeV polarized muon beam scattered off a large double-cell polarized 6LiD target. The results are in agreement with those from previous experiments and improve considerably the statistical accuracy in the region x < 0.03.

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Correspondence to A. Korzenev.

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Korzenev, A. Spin structure function of deuteron g1 d from COMPASS. Eur. Phys. J. A 31, 606–609 (2007). https://doi.org/10.1140/epja/i2006-10175-8

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  • DOI: https://doi.org/10.1140/epja/i2006-10175-8

PACS.

  • 13.60.Hb Total and inclusive cross-sections (including deep-inelastic processes)
  • 13.88.+e Polarization in interactions and scattering