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Production de phi et omega dans les collisions PbPb a 158 GeV par nucléon

Abstract : In the most central collisions of Pb-Pb nuclei at SPS CERN, a plasma of quarks and gluons (QGP) could be formed. J/Psi suppression due to screening effect or increase of the strangeness production in the plasma could be typical signals of such a production.
This thesis deals mainly with the phi production study in the muon pair measured by NA50 in year 2000, with an improved experimental setup, in particular a new minimum bias trigger. The behaviour of J/Psi multiplicity with ET which is obtained in this study does not confirm the additional drop for the most central collisions. Inversely the observed decrease of the J/Psi multiplicity per n-n collisions determined in the Glauber calculation does not seem to saturate.
The multiplicities and cross sections for phi and omega are in agreement with the ones obtained with previous data sets. The recent PPDB change in phi branching ratio into dimuons partly reconciles NA50 phi multiplicities with the one measured by NA49 experiment, solving partly the “phi puzzle” but the slopes of the MT spectra remain very different. In addition, this study underlines the interest of thephi/omega ratio as a direct estimate of the square of the strangeness saturation factor chi_s.
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Submitted on : Thursday, February 5, 2004 - 11:29:38 AM
Last modification on : Wednesday, October 14, 2020 - 3:56:41 AM
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  • HAL Id : tel-00004516, version 1



Tao Wu. Production de phi et omega dans les collisions PbPb a 158 GeV par nucléon. Nuclear Theory [nucl-th]. Université Paris Sud - Paris XI, 2003. English. ⟨tel-00004516⟩



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