Quark helicity distributions from longitudinal spin asymmetries in muon-proton and muon-deuteron scattering
2010
Abstract
Double-spin asymmetries for the production of charged pions and kaons in semi-inclusive deep-inelastic muon scattering have been measured by the COMPASS experiment at CERN. The data, obtained by scattering a 160 GeV muon beam off a longitudinally polarised NH3 target, cover a range of the Bjorken variable x between 0.004 and 0.7.
The resulting values of the sea quark distributions and some other phenomena concerning of the light-quark sea are analyzed and discussed.