About S-bar s, Delta S-Deltabar s and D_d^(K+ - K-) in K^pm Production in Sidis

We consider semi-inclusive unpolarized DIS for the production of charged Kaons and the different possibilities, both in LO and NLO, to test the conventionally used assumptions s-\bar s=0, \Delta s-\Delta \bar s=0 and D_d^{K+ - K-}=0. The considered tests have the advantage that they do not require any knowledge of the fragmentation functions.