Strangeness measurements in NA50 experiment with Pb projectiles

M.C Abreu,M Atayan,Y Le Bornec,T Chambon,C Quintans,S Serci,A.A Grigorian,P Saturnini,S Mehrabyan,M Mac Cormick,M Gallio,V Boldea,A Piccotti,D Jouan,G Puddu,P Force,M Bedjidian,B Chaurand,M Masera,X Tarrago,F.F Guber,A Romana,C Gerschel,Y.K Gavrilov,J Castor,N De Marco,P Rato-Mendes,I Ropotar,A De Falco,R Hakobyan,O Drapier,M Gonin,J Fargeix,L Riccati,L Kluberg,T.L Karavitcheva,F Bellaiche,L Villatte,A Devaux,A Musso,P Macciotta,I Chevrot,N Willis,C Racca,P Petiau,E Chiavassa,S Mourgues,N Constans,P Bordalo,A Baldit,J Astruc,S Ramos,V Caponi,G Dellacasa,P Sonderegger,A Guichard,C Baglin,R Haroutunian,J.r Pizzi ,M Idzik ,L Ramello ,P Giubellino ,M Golubeva ,R Arnaldi ,E Scomparin ,A Marzari‐Chiesa ,S Beolè ,E Vercellin ,M Sitta ,F Malek ,S Silva ,S Diţă ,C Alexa ,S Constantinescu ,R Shahoyan ,H Gulkanyan ,L Capelli ,N Topilskaya ,C Soave ,C Cicalò ,C Lourenço ,B Cheynis ,A Bussière ,J.‐Y Grossiord ,J Cruz ,M Monteno ,B Espagnon ,F Fleuret ,B Alessandro ,A.b Kurepin ,L Ducroux ,W.l Prado Da Silva ,A Masoni ,M P Comets ,Luca Casagrande ,S Filippov ,G L Usai

doi:10.1016/s0375-9474(99)00701-0

Abstract

Low mass dimuons production has been studied in Pb-Pb collisions at 158 GeV/A . φ, ρ and ω contributions are extracted in different transverse mass and transverse energy domains. Preliminary results of the 1996 run display an increase of the φ/(ρ+ω) ratio, coming from an increase of the φ. Cross sections are presented and temperatures extracted.

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