Abstract
The observed quarkonia states in heavy ion collisions provide a powerful tool to probe the dynamics of the Quark Gluon Plasma. Measurements performed on the ground and excited quarkonia states, as well as their separation into prompt and non-prompt components, reveal the effects of colour screening and colour recombination. In addition, quarkonium production rates and their excited to ground state production ratios in lighter p+Pb collisions are an interesting probe of cold nuclear matter effects. In these proceedings, the latest results of the ATLAS experiment at the LHC on these observables will be presented.
Highlights
A broad research program is ongoing at the Large Hadron Collider with the goal of studying the properties of the Quark Gluon Plasma (QGP)
Satz [1] advocated, before any experiment, that an observed suppression of the J/ψ meson would constitute an unambiguous signature of the Quark Gluon Plasma
It is important to disentangle these two production mechanisms because prompt J/ψ production is expected to be sensitive to colour screening and recombination of charm quarks and antiquarks from the medium in the QGP, whereas non-prompt J/ψ is expected to be sensitive to the energy loss of the b-quarks in the QGP
Summary
A broad research program is ongoing at the Large Hadron Collider with the goal of studying the properties of the Quark Gluon Plasma (QGP). The nuclear modification factor in p+Pb collisions for each observed quarkonia state is defined as the ratio of the quarkonium production cross section in p+Pb collisions to the cross section measured in pp collisions at the same centre of mass energy, scaled by the number of nucleons in the lead nucleus: RAA = σpP b/208 × σpp. Measurements of the quarkonia production described in these√proceedings are performed in the dimuon decay channel in Pb+Pb, p+Pb and pp collisions at sNN= 5.02 TeV, with integrated luminosities of 0.42 nb−1, 0.28 nb−1, and 25 pb−1, respectively, collected with the ATLAS experiment at the LHC [5].
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