Speaker
Klaus Rith
(University of Eralngen-Nürnberg)
Description
Single-spin asymmetries were investigated in inclusive and semi-inclusive electroproduction of charged pions and kaons from a transversely polarized hydrogen target at the HERMES experiment. The asymmetries were studied as a function of the azimuthal angle $\psi$ about the beam direction between the 'upwards' target spin direction and the hadron production plane, the transverse hadron momentum $P_T$ relative to the direction of the incident beam and the Feynman variable $x_F$ in the lepton-nucleon center-of-momentum frame. The sin{$\psi$} amplitudes are positive for $\pi^+$ and $K^+$, slightly negative for $\pi^-$ and consistent with zero for $K^-$, with particular $P_T$ but weak $x_F$ dependences. Especially
large asymmetries are observed for two small subsamples of events, where also the scattered electron was recorded by the spectrometer.
Author
Klaus Rith
(University of Eralngen-Nürnberg)
