$phi;, $rho; and $omega; production in Pb$minus;Pb collisions at 158 GeV/c2 per nucleon

N WILLIS, M C Abreau, B Alessandro, C Alexa,R Arnaldi,J Astruc,M Atayan,C Baglin,A Baldit, M Bedjidian, F G Bellaiche,S Beole, V Boldea,A Bussiere, Luigi Capelli, V Caponi,L Casagrande,J Castor,T Chambon,B Chaurand,I Chevrot,B Cheynis, E Chiavassa,C Cicalo,M P Comets,N Constans,Serban Constantinescu,J Cruz,Alessandro De Falco, Nora De Marco,Giuseppe Dellacasa,A Devaux, S Dita,O Drapier,L Ducroux,B Espagnon,J Fargeix,S Filippov, Frederic Fleuret,P Force,M Gallio,Y K Gavrilov,C Gerschel,P Giubellino, M Golubeva,M Gonin,A A Grigorian,J Y Grossiord, F Guber, A Guichard,H Gulkanyan, R Sh Hakobyan,R Haroutunian,M Idzik,D Jouan,T L Karavitcheva,L Kluberg,A B Kurepin, Yves Le Bornec,Carlos Lourenco,P Macciotta,M Mac Cormick, A Marzarichiesa,M Masera,Alberto Masoni,S Mehrabyan,M Monteno,S Mourgues,A Musso,F Ohlssonmalek,P Petiau,A Piccotti,J R Pizzi, Wanda Lucia Prado Da Silva,G Puddu,C Quintans,C Racca, L Ramello,Silvia Ramos,P Ratomendes,L Riccati,A Romana,I Ropotar,P Saturnini,E Scomparin,S Serci,R Shahoyan,S Silva,M Sitta,C Soave,P Sonderegger,X Tarrago,N S Topilskaya,G Usai,E Vercellin,L Villatte

NUCLEAR PHYSICS A（1999）

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摘要

The production of low mass dimuons has been measured in Pb-Pb collisions at the SPS (CERN). (phi/(rho+omega)) ratios have been studied with respect to the centrality of the collision. Preliminary results on phi and (rho+omega) multiplicities as a function of the number of participants are presented. Values for the temperature T are deduced from the cross sections studies in the limited transverse mass M-t domain covered by the experimental apparatus.

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