On the character of leading asymmetry in the hadroproduction of charmed mesons and baryons

The asymmetry between the spectra of leading and nonleading charmed mesons measured in Sigma (-) -A interactions at P-L = 340 GeV/c in the WA89 experiment as well as the asymmetry between the spectra of Lambda (c) and Lambda (-)(c) measured in Sigma (-) A and p - p collisions at p(L)= 600 GeV/c in the E781 experiment are described in the framework of Quark Gluon String Model(QGSM) under the assumption about the fraction of the sea charm quark-antiquark pairs in interacting hyperon. It was shown that the asymmetries between D- and D+ meson spectra and between D-s(-) and D-s(-) meson spectra can be fitted by QGSM curves obtained with the same parameter of string fragmentation, a(1) = 10, as it was done in the description of D-s(-)/D-s(+)- meson asymmetry pi (-) A experiments in previous studies. The character of asymmetry between the spectra of Lambda (c) and <(<Lambda>)over bar>(c) for different sort of beam particle is discussed and the conclusions about the possible fraction of 'intrinsic charm' in the interacting particles are presented. The QGSM results are compared with the calculations in the next-to-leading approximation of perturbative QCD approach carried out by the other authors.