The Strange Quark Polarisation from ChargedKaon Production on Deuterons

摘要

The strange quark helicity distribution Δs(x) is derived at LO from the semi-inclusive and inclusive spin asymmetries measured by the COMPASS experiment at CERN. The significance of the results is found to depend critically on the ratio of the 3 and u quark fragmentation functions into kaons fD_s~(K+)(z)dz/∫D_u~(K+)(z)dz.