phi production in Pb-Pb collisions at 158 GeV/c per nucleon incident momentum

B Alessandro, C Alexa, R Arnaldi, J Astruc, M Atayan, C Baglin, A Baldit, S Beole, V Boldea, P Bordalo, G Borges, A Bussiere, L Capelli, V Caponi, C Castanier, J Castor, B Chaurand, I Chevrot, B Cheynis, E ChiavassaC Cicalo, T Claudino, Comets MP, N Constans, S Constantinescu, Pietro CORTESE, J Cruz, Falco A De, Marco N De, G Dellacasa, A Devaux, S Dita, O Drapier, L Ducroux, B Espagnon, J Fargeix, P Force, M Gallio, Gavrilov YK, C Gerschel, P Giubellino, Golubeva MB, M Gonin, Grigorian AA, S Grigoryan, Grossiord JY, Guber FF, A Guichard, H Gulkanyan, R Hakobyan, M Idzik, D Jouan, Karavitcheva TL, L Kluberg, Kurepin AB, Bornec Y Le, C Lourenco, P Macciotta, Cormick M Mac, Chiesa A Marzari, M Masera, A Masoni, M Monteno, A Musso, P Petiau, A Piccotti, Pizzi JR, da Silva WP, F Prino, G Puddu, C Quintans, Luciano RAMELLO, S Ramos, Mendes PR, L Riccati, A Romana, H Santos, P Saturnini, E Scalas, E Scomparin, S Serci, R Shahoyan, F Sigaudo, S Silva, Mario SITTA, P Sonderegger, X Tarrago, Topilskaya NS, Usai GL, E Vercellin, L Villatte, N. Willis

Risultato della ricerca: Contributo su rivistaArticolo in rivistapeer review

Abstract

The production of vector mesons phi, rho and omega has been measured in Pb-Pb collisions at 158 GeV/c per nucleon incident momentum at the CERN/SPS. The muon spectrometer of experiment NA50 detects phi, rho and omega mesons via their mu(+)mu(-) decay channel in the collision center of mass rapidity range 0 less than or equal to gamma(CM) less than or equal to 1. The results reported here show that the relative production of the phi compared to the (rho + omega) and the phi multiplicity per participant nucleon (N-part) increase with the centrality of the collision. On the other hand, the (p + w) multiplicity per participant does not exhibit any N-part dependence within our errors. The inverse slope parameter as deduced from an exponential fit to the phi transverse mass distribution is 228 +/- 10 MeV. Our results are compared with those obtained by experiment NA49 and with theoretical calculations. (C) 2003 Elsevier Science B.V. All rights reserved.
Lingua originaleInglese
pagine (da-a)147-154
Numero di pagine8
RivistaPHYSICS LETTERS. SECTION B
Volume555
Numero di pubblicazione3-4
DOI
Stato di pubblicazionePubblicato - 2003

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