About S-\bar s, \Delta S-\Delta\bar 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. 
Ekaterina Christova and Elliot Leader