On the Character of Leading Asymmetry in the Hadroproduction of Charmed Mesons and Baryons

Abstract

The character of asymmetry between the spectra of Lambda_c and antiLambda_c in the E781 experiment (FNAL) is discussed on the basis of the Quark Gluon String Model(QGSM). As it was shown in the description of 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 in previous studies, the asymmetries between D^- and D^+ meson spectra and between D_s^- and D^+_s meson spectra can be fitted by QGSM curves with the same parameter of string fragmentation, a_1=10, as well as the asymmetry between the D-meson spectra in pion-nuclear collisions in the E791 experiment. The forms of Lambda_c/antiLambda_c asymmetry dependences measured in Sigma^-A and p-A collisions at p_L= 600 GeV/c in the E781 experiment are different . It is shown in the framework of QGSM that they depend on whether the diquarks of beam and target particles took part in charmed baryon formation or not. The QGSM results are compared with the calculations carried out by the other authors.

Comments: 4 pages in LaTeX with 3 epsfigures, contribution to the Proceedings of the 4th International Conference "Hyperons, Charm and Beauty Hadrons", Valencia, Spain, 26-30 June, 2000