Survey of ALT ' asymmetries in semi-exclusive electron scattering on He-4 and C-12

Abstract Single spin azimuthal asymmetries A L T ′ were measured at Jefferson Lab using 2.2 and 4.4 GeV longitudinally polarised electrons incident on 4 He and 12 C targets in the CLAS detector. A L T ′ is related to the imaginary part of the longitudinal-transverse interference and in quasifree nucleon knockout it provides an unambiguous signature for final state interactions (FSI). Experimental values of A L T ′ were found to be below 5%, typically | A L T ′ | ⩽ 3 % for data with good statistical precision. Optical model in eikonal approximation (OMEA) and relativistic multiple-scattering Glauber approximation (RMSGA) calculations are shown to be consistent with the measured asymmetries.