Abstract
Lattice QCD calculations [1] predict that, at sufficiently large-energy densities, hadronic matter undergoes a phase transition to a “plasma” of deconfined quarks and gluons (QGP). Considerable efforts have been invested since 1986 in the study of high-energy heavy-ion collisions to reveal the existence of this phase transition and to study the properties of strongly interacting matter in the new phase, in view of improving our understanding of confinement, a crucial feature of QCD. The study of quarkonium production and suppression is among the most interesting investigations in this field, because the calculations indicate that the QCD binding potential is screened in the QGP phase, the screening level increasing with the energy density of the system. Given the existence of several quarkonium states, of different binding energies, it is expected that they will be consecutively “dissolved” (into open charm or beauty mesons) above certain energy density thresholds [2,3].
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Acknowledgments
The studies reported in this chapter were made in collaboration with Ramona Vogt and Jõao Seixas. They also reflect discussions, over many years, with Helmut Satz and several other people. We acknowledge fruitful discussions with Gonçalo Borges and Helena Santos (NA50), Mike Leitch (E866), Philippe Charpentier (NA3) and Roberto Spighi (HERA-B). The work of P.F. and H.K.W. was supported by the Fundaç ̃ao para a Ci^encia e a Tecnologia, Portugal, under contracts SFRH/BPD/42343/2007 and 42138/2007
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Lourenço, C., Faccioli, P., Wöhri, H.K. (2009). Quarkonium Production and Absorption in Proton-Nucleus collisions. In: Sarkar, S., Satz, H., Sinha, B. (eds) The Physics of the Quark-Gluon Plasma. Lecture Notes in Physics, vol 785. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-02286-9_6
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