Speaker
Hongyan Yang
(CEA - Centre d'Etudes de Saclay (FR))
Description
Charmonium production in heavy ion collisions has been studied at different energies and with different collision systems over the last few decades, ever since the J/psi suppression induced by color screening of its constituent quarks was proposed as a signature of the formation of a quark gluon plasma (QGP) in heavy-ion collisions. The recent measurement of the J/psi production in Pb-Pb collisions at forward rapidity performed by ALICE at the LHC clearly showed less suppression with respect to SPS and RHIC results. The J/psi elliptic flow v2 provides an important tool to test the degree of J/psi thermalisation in Pb-Pb collisions at sqrt(s_NN) = 2.76 TeV. It may also help in understanding the J/psi (re)generation mechanism in the QGP, which is expected to play a more important role at LHC energies.
We present the elliptic flow of J/psi measured in the dimuon channel
at forward rapidity ( 2.5 < y < 4.0 ) with the ALICE muon spectrometer, down to zero transverse momentum. The centrality dependence of the pt-integrated elliptic flow will be discussed. In addition, the pt and rapidity dependence in several centrality classes will be presented, as well as the systematical studies based on using various methods for measuring the elliptic flow. Finally, results will be compared with existing measurements at RHIC and theoretical calculations.
Author
Collaboration ALICE
(CERN Geneva Switzerland)
Co-author
Hongyan Yang
(CEA - Centre d'Etudes de Saclay (FR))
