Eur Phys J C (2004) 33: s618-s620
https://doi.org/10.1140/epjcd/s2004-03-1705-3

PS06 High Energy Nuclear Physics

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

¹ Physics Department, University of Athens, Athens, Greece,  
² Dipartimento IA di Fisica dell’Università e del Politecnico and INFN, Bari, Italy,  
³ Fysisk Institutt, Universitetet i Bergen, Bergen, Norway,  
⁴ Høgskolen i Bergen, Bergen, Norway,  
⁵ School of Physics and Astronomy, University of Birmingham, Birmingham, UK,  
⁶ Comenius University, Bratislava, Slovakia,  
⁷ University of Catania and INFN, Catania, Italy,  
⁸ CERN, European Laboratory for Particle Physics, Geneva, Switzerland,  
⁹ Institute of Experimental Physics, Slovak Academy of Science, Košice, Slovakia,  
¹⁰ P.J. Šafárik University, Košice, Slovakia,  
¹¹ Fysisk Institutt, Universitetet i Oslo, Oslo, Norway,  
¹² University of Padua and INFN, Padua, Italy,  
¹³ Collège de France, Paris, France,  
¹⁴ Institute of Physics, Academy of Sciences of the Czech Republic, Prague, Czech Republic,  
¹⁵ University “La Sapienza” and INFN, Rome, Italy,  
¹⁶ Dip. di Scienze Fisiche “E.R. Caianiello” dell’Università and INFN, Salerno, Italy,  
¹⁷ State University of St. Petersburg, St. Petersburg, Russia,  
¹⁸ Institut de Recherches Subatomique, IN2P3/ULP, Strasbourg, France,  
¹⁹ Utrecht University and NIKHEF, Utrecht, The Netherlands,  

Received: 14 October 2003
Accepted: 9 February 2004
Published online: 26 February 2004

Abstract

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.