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.