Baryon and antibaryon production in hadronic and nuclear interactions

摘要

We introduce a new formulation of the diquark breaking mechanism which describes with no free parameters the huge nuclear stopping observed in central nucleus-nucleus collisions. Supplemented, in the dual parton model, with strings originating from diquark-antidiquark pairs from the nucleon sea, it gives a substantial increase of hyperon and antihyperon yields from pPb collisions. Compared to data, this increase is slightly underestimated for #LAMBDA#’s and #XI#’s but is five times too small for #OMEGA#’s. Introducing final state interactions, a reasonable description of all baryon and antibaryon yields is achieved.