Studies of single‐spin asymmetries in pions electroproduction in semi‐inclusive deep‐inelastic scattering of 5.776 GeV polarized electrons from an unpolarized and polarized targets, using the CEBAF Large Acceptance Spectrometer (CLAS) at the Thomas Jefferson National Accelerator Facility, are presented. A substantial sin??_h amplitude has been measured in the the cross section as a function of the azimuthal angle ?_h of the produced neutral pion. The dependence of this amplitude on Bjorken x and on the pion transverse momentum has been extracted with significantly higher precision than previous data and is compared to model calculations.
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