Eur. Phys. J. C (1998) 5: 63-75
https://doi.org/10.1007/s100529800892

Experimental physics

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

⁷ University of Bari and INFN, Bari, Italy
¹ CERN, CH-1211, Geneva, Switzerland
³ Slovak Academy of Sciences, Kosice, Slovak Republic
⁴ University of Montreal, Montreal, Canada
¹¹ Lebedev Institute of Physics, Moscow, Russia
¹³ Institute of Physics and Engineering, Moscow, Russia
¹⁰ University of Rome “La Sapienza” and INFN Rome, Italy
⁶ DAPNIA, CE-Saclay, Gif/Yvette, France
⁸ University of Turin and INFN Turin, Italy
² McGill University, Montreal, Canada
⁹ Tel Aviv University, Tel Aviv, Israel
¹² University College, London, Great Britain
¹⁴ Tel Aviv University, Tel Aviv, Israel

Received: 27 October 1997
Revised: 5 March 1998
Published online: 16 September 2013

Abstract

Results are presented on p + ω,ø and J/ψ production in p-W and ³²S-W interactions at 200GeV/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_ø/ (Bσ_ρ + Bσ_ω), 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 ø’s per charged particle. The ratio is measured in different intervals of pt and rapidity. It is not clearly dependent on pt, 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.