A. Badalà

Enhancement of hyperon production at central rapidity in 158 A GeV/c Pb–Pb collisions

Results are presented on hyperon and antihyperon production in Pb–Pb, pPb and pBe collisions at 158 GeV/c per nucleon. Λ, Ξ and Ω yields have been measured at central rapidity and medium transverse momentum as functions of the centrality of the collision. Comparing the yields in Pb–Pb to those in pBe interactions, strangeness enhancement is observed. The enhancement increases with the centrality and with the strangeness content of the hyperons, reaching a factor of about 20 for the Ω in the central Pb–Pb collisions.

Energy dependence of hyperon production in nucleus–nucleus collisions at SPS

A measurement of strange baryon and antibaryon production in Pb-Pb collisions has been carried out by the NA57 experiment at the CERN SPS, with 40 and 158 A GeV/c beam momentum. Results on

Strangeness enhancements at central rapidity in 40 A GeV/c Pb-Pb collisions

Lambda

Central-to-peripheral nuclear modification factors in Pb-Pb collisions at √sNN = 17.3 GeV

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Study of the transverse mass spectra of strange particles in Pb–Pb collisions at 158 A GeV/c

Xi

Rapidity distributions around mid-rapidity of strange particles in Pb–Pb collisions at 158 A GeV/c

and

Vertex finding in ALICE by the use of silicon pixel layers in the inner tracking system

Omega

Silicon pixel detectors for tracking in NA57

hyperon yields at mid-rapidity in the most central 53% of Pb-Pb collisions at 40 A GeV/c are presented and compared with those obtained at higher energy, in the same collision centrality range. The

Multiplicity of charged particles in Pb–Pb collisions at SPS energies

Lambda

Hyperon yields in Pb-Pb collisions from Na57 experiment

and