The study of muon pairs in the mass region 1.5 < M-mu mu < 2.5 GeV/c(2) in 450 GeV/c p-A, 200 GeV/nucleon S-U and 158 GeV/nucleon Pb-Pb collisions is presented. In p-A interactions. the dimuon signal mass spectra are well described by a superposition of Drell-Yan and charmed meson semi-leptonic decay contributions, in agreement with previous experiments when considering a linear A dependence. In nucleus-nucleus reactions, taking only into account these two physical ingredients, a dimuon enhancement both with increasing A.B and centrality is observed.
Dimuon enhancement in nucleus-nucleus ultrarelativistic interactions
DE FALCO, ALESSANDRO
1999-01-01
Abstract
The study of muon pairs in the mass region 1.5 < M-mu mu < 2.5 GeV/c(2) in 450 GeV/c p-A, 200 GeV/nucleon S-U and 158 GeV/nucleon Pb-Pb collisions is presented. In p-A interactions. the dimuon signal mass spectra are well described by a superposition of Drell-Yan and charmed meson semi-leptonic decay contributions, in agreement with previous experiments when considering a linear A dependence. In nucleus-nucleus reactions, taking only into account these two physical ingredients, a dimuon enhancement both with increasing A.B and centrality is observed.
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