The color transparency (CT) of a hadron, propagating with reduced absorption in nucleus, is fundamental property QCD (quantum chromodynamics) reflecting its internal structure and effective size when it produced at high transverse momentum, Q. CT has been confirmed many experiments, such as semi-exclusive hard electroproduction, eA?e??X, for mesons Q2>3GeV2. However, recent JLab (Jefferson L...

A first measurement of the longitudinal beam spin asymmetry ALU in semi-inclusive electroproduction pairs charged pions is reported. a higher-twist observable and offers cleanest access to nucleon twist-3 parton distribution function e(x). Data have been collected Hall-B at Jefferson Lab by impinging 5.498-GeV electron on liquid-hydrogen target, reconstructing scattered pion pair with CLAS dete...

It is shown that the existence of left-right asymmetry in single-spin inclusive Lambda production, together with the characteristic features of the data, should be considered as another clear signature for the existence of orbiting valence quarks in polarized nucleons. Predictions for other hyperons are made. It is pointed out that measurements of such asymmetries are very helpful not only for ...