Charmed hadron production in neutrino reactions and polarized s-quark distribution

In order to obtain information about the polarized strange quark distribution, we studied the semi-inclusive Λc+/Λ̄c+ production in neutrino and polarized proton collisions. We found that these reactions are effective to clearly extract the polarization of strange quark by measuring the spin correlation between the target proton and the produced Λc+/Λ̄c+ baryon.