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J/ψ and Drell-Yan cross-sections in Pb---Pb interactions at 158 GeV/c per nucleon |
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| Affiliation: | a Laboratoire de Physique des Particules (LAPP), IN2P3-CNRS, Annecy-le-Vieux, France b Institute of Atomic Physics (IFA), Bucharest, Romania c Università di Cagliari/INFN, Cagliari, Italy d Laboratoire de Physique Corpusculaire, Université Blaise Pascal et IN2P3-CNRS, Clermont-Ferrand, France e CERN, Geneva, Switzerland f Laboratório de Instrumentação e Física Experimental de Partículas (LIP), Lisbon, Portugal g Institute for Nuclear Research (INR), Moscow, Russia h Institut de Physique Nucléaire, Université Paris-Sud et IN2P3-CNRS, Orsay, France i Laboratoire de Physique Nucléaire des Hautes Energies, Ecole Polytechnique et IN2P3-CNRS, Palaiseau, France j Centre de Recherches Nucléaires, Université Louis Pasteur et IN2P3-CNRS, Strasbourg, France k Università di Torino e INFN, Turin, Italy l Institut de Physique Nucléaire de Lyon, Université Claude Bernard et IN2P3-CNRS, Villeurbanne, France |
| Abstract: | First results are reported on J/ψ and Drell-Yan cross-sections in Pb---Pb reactions at 158 GeV/c per nucleon. The ratio of cross-sections σJ/ψ/σDY is studied as a function of the impact parameter of the collision estimated from the measured transverse energy. |
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