Muon pairs produced in Pb–Pb interactions at 158 GeV/ c per nucleon are used to study the transverse momentum distributions of the J/ ψ , ψ ′ and dimuons in the mass continuum. In particular, the dependence of these distributions on the centrality of the Pb–Pb collision is investigated in detail.
PT distribution from the IMR distributions. Data extracted from jpg figures with g3data. The (sys) error corresponds to the error given byg3data due to extraction, statistical errors are not separated and set to 0.
PT distribution from the J/PSI distributions. Data extracted from jpg figures with g3data. The (sys) error corresponds to the error given byg3data due to extraction, statistical errors are not separated and are set to 0.
PT distribution from the PSI(3685) distributions. Data extracted from jpg figures with g3data, DSYS corresponds to the error given byg3data due to extraction, statistical errors not included.
The NA50 Collaboration has measured heavy-quarkonium production in p-A collisions at 450 GeV incident energy (sqrt(s) = 29.1 GeV). We report here results on the production of the Upsilon states and of high-mass Drell-Yan muon pairs (m > 6 GeV). The cross-section at midrapidity and the A-dependence of the measured yields are determined and compared with the results of other fixed-target experiments and with the available theoretical estimates. Finally, we also address some issues concerning the transverse momentum distributions of the measured dimuons.
Mean pT and Mean PT**2 for Drell-Yann (4.5<MMUMU<8 GeV/c**2) Errors for Drell-Yann are purely statistical, error value for Upsilon includes a systematical error due to uncertianty in the extrapolation of the drell-yann yield into the upsilon region. The total error is anyway dominated by the statistical contribution.
ALPHA parameter.
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