Original scientific paper
Strange hyperon production in p + p and p + Pb interactions from NA49
Tome Antičić
; Ruđer Bošković Institute, Zagreb, Croatia
Sandra Horvat
; Ruđer Bošković Institute, Zagreb, Croatia
Krešo Kadija
; Ruđer Bošković Institute, Zagreb, Croatia
Tatjana Suša
; Ruđer Bošković Institute, Zagreb, Croatia
Abstract
In the NA49 experiment, data on Λ, Λ, Ξ ¯ − and Ξ¯+ hyperons in minimum-bias p + p and centrality-selected p + Pb collisions at 158 GeV/c have been obtained. For the first time, p + p measurements have been done for Ξ− and Ξ¯+ in the kinematic region around central rapidity. Observed yields increase faster than the number of wounded nucleons when comparing p + Pb to p + p. As already observed in A + A collisions, the increase is larger for multistrange than for strange baryons and for baryons than for anti-baryons. By comparing the energy dependence of Λ and Λ production at mid-rapidity, a striking similarity is observed between p + p and ¯ A + A data. This is also seen in the energy dependence of the Λ/π ratio.
Keywords
minimum-bias p + p collisions; centrality-selected p + Pb collisions; Λ; Λ; Ξ ¯ − and Ξ¯+ hyperons; yields; number of wounded nucleons; multistrange baryons; Λ/π ratio
Hrčak ID:
304057
URI
Publication date:
1.10.2001.
Visits: 123 *