On Mechanism of Charmed c-Quarks Fragmentation in Hadronic Collisions

We propose a modification of the mechanism of charmed quarks fragmentation into $D$ mesons in hadronic collisions. It is shown that the distinction in valence quark distributions in the initial ${\pi }^{\pm }$ and $K^{\pm }$ mesons leads to different inclusive spectra of $D$ and $D_s$ mesons produced in ${\pi }^{\pm }$ and $K^{\pm }$ beams.