LEADING EFFECTS IN HADROPRODUCTIONS OF Λ_cAND D FROM CONSTITUENT QUARK–DIQUARK CASCADE PICTURE

Abstract

We discuss the hadroproductions of Λc,Λc, D andD in the framework of the constituent quarkdiquark cascade model taking into account the valence quark annihilation. The spectra of Λc andΛc in pA, Σ − A and π − A collisions are well explained by the model using the values of parameters used in hadroproductions of D andD. It is shown that the role of valence diquark in the incident baryon is important forD productions as well as for Λc production.

Charm production in DPMJET

“…Therefore leading particles are copiously produced at large x F in the forward region of the incident hadron, resulting in an asymmetry between leading and non-leading particles. This phenomenon is referred to as the leading quark effect [33]. SELEX finds in the fragmentation region of protons and Σ − hyperons Λ + c charmed hyperons with a comparatively flat Feynman-x (x F ) distribution.…”