Flavour separation of helicity distributions from deep inelastic muon-deuteron scattering
Compass Collaboration and Alekseev, M. and Alexakhin, V.~Y. and Alexandrov, Y. and Alexeev, G.~D. and Amoroso, A. and Austregesilo, A. and Badelek, B.
Keywords
Total and inclusive cross sections, Meson production, Polarization in interactions and scattering
Abstract
We present a LO evaluation of helicity densities of valence, Delta u_v_s16Delta d_v, non-strange sea, Deltabar{u}_s16Deltabar{d}, and strange quarks, Delta s (assumed to be equal to Deltabar{s}). They have been obtained from the inclusive asymmetry A_{3,d} and the semi-inclusive asymmetries A^{pi_s16}_{1,d}, A^{pi-}_{1,d}, A^{K_s16}_{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
