Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2012-03-01
Physics
High Energy Physics
High Energy Physics - Phenomenology
22 pages, 25 eps figures
Scientific paper
We calculate the yields of quarkonia in heavy ion collisions at RHIC and the LHC as a function of the transverse momentum. Based upon heavy quark effective theory, our results include both color-singlet and color-octet contributions and feed-down effects from excited states. In reactions with ultra-relativistic nuclei, we focus on the consistent implementation of dynamically calculated nuclear matter effects, such as coherent power corrections, cold nuclear matter energy loss and the Cronin effect, in the initial state and collisional dissociation of quarkonia in the final state, as they traverse through the QGP. Theoretical results are presented for J/psi and Upsilon and compared to experimental data where applicable. At RHIC, a good description of the high-pT J/psi modification observed in central Cu+Cu and Au+Au collisions can be achieved within the model uncertainties. We find that J/psi measurements in proton-nucleus reactions are needed to constrain the magnitude of cold nuclear matter effects. At the LHC, a good description of the experimental data can be achieved only in mid-central and peripheral Pb+Pb collisions. The large five-fold suppression of prompt J/psi in the most central nuclear reactions may indicate for the first time possible thermal effects at the level of the quarkonium wavefunction at large transverse momentum.
Sharma Rishi
Vitev Ivan
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