Abstract
We present a leading order evaluation of the helicity distributions for the three lightest quark and anti-quark flavours, derived from the double-spin asymmetries measured by the COMPASS experiment at CERN. The data, obtained by scattering a 160 GeV muon beam off longitudinally polarised NH3 and 6LiD targets, cover the Bjorken variable x range 0.004 < x < 0.7. The resulting values of the sea quark distributions are all small and do not show any sizable dependence on x in the range of the measurements. No significant difference is observed between the strange and anti-strange helicity distributions, both compatible with zero. The integrated value of the polarised flavour sea asymmetry is slightly positive, about 1.5 standard deviations away from zero.
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