Semi-inclusive Λc+ leptoproductions and polarized gluon distributions

In order to extract the behavior and magnitude of the spin-dependent gluon distribution, we propose a semi-inclusive Λc production using unpolarized lepton beams and polarized proton targets. The correlation between the target proton spin and the spin of Λc+ produced in the target fragmentation region might be very effective for testing various models of polarized gluons.