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Single-spin asymmetries were investigated in inclusive electroproduction of charged pions and kaons from transversely polarised protons at the HERMES experiment. The asymmetries were studied as a function of the azimuthal angle Ψ around the beam direction between the target-spin direction and the hadron production plane, the transverse hadron momentum PT relative to the direction of the incident beam, and the Feynman variable xF . The sinΨ amplitudes are positive for π+ and K+, slightly negative for π− and consistent with zero for K−, with particular PT but weak xF dependences. Large asymmetries are observed for two small subsamples of events, where also the scattered electron was recorded by the spectrometer.

HERMES results on transverse target single-spin asymmetries in inclusive electroproduction of charged pions and kaons