Leading/nonleading charm hadroproduction in the quark-gluon string model

摘要

Leading charm production in reaction \pi^- N \rightarrow DX is discussed.Three experiments at Fermilab and CERN have measured a rather large enhancement in production rate of leading D^--mesons over nonleading D^+.A good description of these results is obtained in Quark Gluon String Model (QGSM) if the idea of 'intrinsic charm' is involved. The weight of the c\bar{c} pairs in the quark sea of colliding hadrons is estimated from the experimental data. The comparison with other theoretical models is also carried out.