Flavour Separation of Helicity Distributions from Deep Inelastic Muon-Deuteron Scattering

Details Flavour Separation of Helicity Distributions from Deep Inelastic Muon-Deuteron Scattering Flavour Separation of Helicity Distributions from Deep Inelastic Muon-Deuteron Scattering

2009-05-18

arxiv.org/abs/0905.2828v1

Physics

High Energy Physics

High Energy Physics - Experiment

15 pages, 8 figures

Scientific paper

We present a LO evaluation of helicity densities of valence, \Delta u_v+\Delta d_v, non-strange sea, \Delta\bar{u}+\Delta\bar{d}, and strange quarks, \Delta s (assumed to be equal to \Delta\bar{s}). They have been obtained from the inclusive asymmetry A_{3,d} and the semi-inclusive asymmetries A^{\pi+}_{1,d}, A^{\pi-}_{1,d}, A^{K+}_{1,d}, A^{K-}_{1,d} measured in polarised deep inelastic muon-deuteron scattering. The full deuteron statistics of COMPASS (years 2002-2004 and 2006) has been used. The data cover the range Q^2 > 1 (GeV/c)^2 and 0.004

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