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Azimuthal single-spin asymmetries (SSA) in semi-inclusive electroproductionof pi-mesons and charged K-mesons in deep-inelastic scattering of positrons andelectrons on a transversely polarised hydrogen target were observed.Significant SSA amplitudes for both the Collins and the Sivers mechanism arepresented for the full data set recorded with transverse target polarisation atthe HERMES experiment.

HERMES measurements of Collins and Sivers asymmetries from a transversely polarised hydrogen target