Hyperon production in lead–lead interactions at 40 and 160 A GeV/c

The NA57 experiment has measured strange baryon and antibaryon production in Pb-Pb collisions at 40 A GeV/c and 160 A GeV/c beam momenta. This presentation covers strangeness enhancement and transverse spectra from the 160 A GeV/c data, and energy dependence of the particle yields. Enhancement factors increase with increasing strangeness content of the particle, when production yields from Pb-Pb collisions are compared with those observed in p-Be and p-Pb interactions. The transverse mass spectra have been analysed both with exponential fits and using a transverse flow model. © 2004, Springer-Verlag, Società Italiana di Fisica

Hyperon yields in Pb-Pb collisions from NA57 experiment

We report results from the experiment NA57 at CERN SPS on hyperon yields at midrapidity in Pb-Pb collisions at 158 A GeV/c and 40 A GeV/c. Λ, and Ω yields are compared with preliminary results from the STAR experiment at BNL. © 2003 Elsevier Science B.V. All rights reserved

Results on 40 A GeV/c Pb-Pb collisions from the NA57 experiment

The NA57 experiment has been designed to study the onset of the strange baryon and antibaryon enhancements in Pb-Pb with respect to p-Be collisions, first observed by WA97 at 160 A GeV/c. NA57 has extended the WA97 measurements to investigate the evolution of strangeness enhancement over a wider centrality range and as a function of the beam energy. Results on hyperon production in central Pb-Pb collisions at 40 A GeV/c are presented and compared with those obtained at higher energy, in the same centrality range. © 2003 Elsevier Science B.V. All rights reserved

Hyperon production in 40 A GeV / c collisions from the NA57 experiment

Enhancements of strange baryon and anti-baryon yields were first observed in Pb-Pb interactions at 160 A GeV / c by WA97. The aim of the NA57 experiment is to investigate how these enhancements behave as a function of energy, and over a broader centrality range than that which was available with WA97. This paper presents a comparison of the hyperon yields in Pb-Pb interactions at 40 A GeV / c and 160 A GeV / c. Preliminary signals for the p-Be data at 40 A GeV / c are also shown