Lambda and Lambda Production in Central Pb-Pb Collisions at 40, 80, and 158A GeV.

T Anticic,B Baatar,D Barna,J Bartke,M Behler,L Betev,H Bialkowska,A Billmeier,C Blume,B Boimska,M Botje,J Bracinik,R Bramm,R Brun,P Buncic,V Cerny,P Christakoglou,O Chvala,JG Cramer,P Csato,N Darmenov,A Dimitrov,P Dinkelaker,V Eckardt,P Filip,D Flierl,Z Fodor,P Foka,P Freund,V Friese,J Gal,M Gazdzicki,G Georgopoulos,E Gladysz,S Hegyi,C Hohne,K Kadija,A Karev,VI Kolesnikov,T Kollegger,E Kornas,R Korus,M Kowalski,I Kraus,M Kreps, M van Leeuwen,P Levai,L Litov,M Makariev,AI Malakhov,C Markert,M Mateev,BW Mayes,GL Melkumov,C Meurer,A Mischke,M Mitrovski,J Molnar,S Mrowczynski,G Palla,AD Panagiotou,D Panayotov,K Perl,A Petridis,M Pikna,L Pinsky,F Puhlhofer,JG Reid,R Renfordt,W Retyk,C Roland,G Roland,M Rybczynski,A Rybicki,A Sandoval,H Sann,N Schmitz,P Seyboth,F Sikler,B Sitar,E Skrzypczak,G Stefanek,R Stock, H Strobele,T Susa,I Szentpetery,J Sziklai,TA Trainor,D Varga,M Vassiliou,GI Veres,G Vesztergombi,D Vranic,A Wetzler,Z Wlodarczyk,IK Yoo,J Zaranek,J Zimanyi

Physical Review Letters（2003）

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Abstract

Production of Lambda and Antilambda hyperons was measured in central Pb-Pb collisions at 40, 80, and 158A GeV beam energy on a fixed target. Transverse mass spectra and rapidity distributions are given for all three energies. The Lambda/pi ratio at midrapidity and in full phase space shows a pronounced maximum between the highest BNL Alternating Gradient Synchrotron and 40A GeV CERN Super Proton Synchrotron energies, whereas the Lambda/pi ratio exhibits a monotonic increase.

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