Study of vector mesons in dimuon production in a large kinematic region in p-W and S-W interactions at 200 GeV/c/nucleon

A. L.S. Angelis, J. Antos, M. Beaulieu, H. Beker, G. Briskin, J. Bystricky, M. G. Catanesi, P. Cerello, S. Dagan, G. Dellacasa, M. Diehl, S. Di Liberto, B. Dolgoshein, M. Esten, C. W. Fabjan, A. Gaidot, M. Gallio, P. Giubellino, U. Goerlach, C. GuerraL. A. Hamel, S. Konovalov, I. Kralik, G. London, F. Martelli, J. P. Martin, M. Masera, M. A. Mazzoni, F. Meddi, M. T. Muciaccia, S. Muraviev, A. Nomerotsky, Y. Oren, J. P. Pansart, G. Poulard, L. Ramello, L. Riccati, G. Rosa, L. Sandor, M. Sarris, E. Scomparin, A. Shmeleva, S. Simone, S. Smirnov, P. Taras, J. Urban, E. Vercellin

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Results are presented on ρ + ω, (latin small letter o with stroke) and J/Ψ production in p-W and 32S-W interactions at 200 GeV/c/nucleon measured via the dimuon decay in a large kinematic region. The data are normalized to the charged particle multiplicity in the same rapidity interval. They have been collected using the HELIOS/3 muon spectrometer at the CERN SPS. The ratio Bσ(latin small letter o with stroke)/ (Bσρ, + Bσω), where B is the relevant resonance μμ branching fraction, increases between proton and sulphur projectiles, and is somewhat enhanced going from peripheral to central S-W interactions. This results from an increase in the number of produced (latin small letter o with stroke)'s per charged particle. The ratio is measured in different intervals of pΤ and rapidity. It is not clearly dependent on pΤ, but is larger at higher rapidities. J/Ψ production, likewise normalized to charged multiplicity, is significantly lower in S-W compared to p-W interactions.

Original languageEnglish
Pages (from-to)63-75
Number of pages13
JournalEuropean Physical Journal C
Issue number1
StatePublished - 1998


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