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FIZIKA B 10 (2001) 4, 269-278
 
STRANGE HYPERON PRODUCTION IN p + p AND p + Pb
INTERACTIONS FROM NA49
TOME ANTIČIĆ, SANDRA HORVAT, KREŠO KADIJA and TATJANA SUŠA
Ruđer Bošković Institute, Zagreb, Croatia
Dedicated to Professor Kseno Ilakovac on the occasion of his 70th
birthday
Received 8 December 2001; Accepted 21 January 2002
Online 6 April 2002
In the NA49 experiment, data on L, [`(L)], X- and [`(X)]+ 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 X- and [`(X)]+
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 L and [`(L)]
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 L/p ratio.
PACS numbers: 13.75.Cs, 25.75.Dw
UDC 539.126
Keywords: minimum-bias p + p collisions, centrality-selected p + Pb collisions, L, [`(L)], X- and [`(X)]+
hyperons, yields, number of wounded nucleons, multistrange baryons, L/p ratio
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