phi and rho+omega vector-mesons produced in lead-induced collisions

C Quintans for the NA Collaborati Abreu,B Alessandro,C Alexa,R Arnaldi,M Atayan,C Baglin,A Baldit,M Bedjidian, S Beol$egrave$, V Boldea,P Bordalo,S R Borenstein,G Borges,A Bussi$egrave$re,L Capelli,J Castor,C Castanier,B Chaurand,B Cheynis, E Chiavassa, C Cical$ograve$,T Claudino,M P Comets,N Constans,S Constantinescu,P Cortese,J Cruz,A De Falco,G Dellacasa,N De Marco,A Devaux,S Dita,O Drapier,B Espagnon,J Fargeix,P Force,M Gallio,Y K Gavrilov,C Gerschel,P Giubellino,M B Golubeva,M Gonin,A A Grigorian,S Grigorian,J Y Grossiord,F F Guber,A Guichard,H Gulkanyan,R Hakobyan,R Haroutunian,M Idzik,D Jouan,T L Karavitcheva,L Kluberg,A B Kurepin,Y Le Bornec, C Louren$ccedil$o,P Macciotta,M Mac Cormick,A Marzari-Chiesa,M Masera, A Masoni,M Monteno,A Musso,P Petiau,A Piccotti,J R Pizzi,W L Prado da Silva,F Prino,G Puddu,C Quintans,L Ramello,S Ramos,P Rato Mendes,L Riccati,A Romana,H Santos,P Saturnini,E Scalas,E Scomparin,S Serci,R Shahoyan,F Sigaudo,S Silva,M Sitta,P Sonderegger,X Tarrago,N S Topilskaya,G L Usai,E Vercellin,L Villatte,N Willis

JOURNAL OF PHYSICS G-NUCLEAR AND PARTICLE PHYSICS（2002）

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Abstract

The experiment NA50 studies the strangeness production by means of the BR(mumu)(phi)sigma(phi)/(BR(mumu)(rho)sigma(rho) + BR(mumuomega)sigma(omega)) cross-sections ratio in relativistic heavy ion collisions with respect to proton and light ion collisions. New results for Pb+Pb interactions at 158 A GeV/c are presented (1998 data) and analysed with a different method. The BR(mumu)(phi)sigma(phi)/(BR(mumu)(rho)sigma(rho) + BR(mumu)(omega)sigma(omega)) ratio shows an increase with the number of participants, in agreement with previous results. The inverse slope parameter extracted from the M-T universal scaling is also studied.

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