EIS - An Imaging Survey for VLT Science

The imaging data assembled by the recently completed ESO Imaging Survey (EIS) are reviewed and their scientific value briefly assessed. Among the various applications, the imaging data has been used to build a large sample of candidate distant clusters of galaxies in the Southern Hemisphere to be used for follow-up observations with the VLT as well as other space and ground-based facilities. Preliminary results from ongoing work to confirm these candidates are reported and the future prospects discussed.Comment: 6 pages, To be published in the Proceedings of the ``VLT Opening Symposium'', Antofagasta (Chile), 1-4 March 199

Charmonium production in Pb-Pb collisions with ALICE at the LHC

We report on published charmonium measurements performed by ALICE, at the LHC, in Pb-Pb collisions at a center of mass energy per nucleon-nucleon collision $\sqrt{s_{\rm NN}} = 2.76$ TeV, at both mid ($|y|<0.8$) and forward ($2.5<y<4$) rapidities. The nuclear modification factor of inclusive ${\rm J}/\psi$ is presented as a function of the collision centrality and the ${\rm J}/\psi$ transverse momentum, $p_{\rm T}$. The variation of the ${\rm J}/\psi$ mean transverse momentum square as a function of the collision centrality is also discussed. These measurements are compared to state of the art models that include one or several of the following mechanisms: color screening of the charm quarks, statistical hadronization at the QGP phase boundary, balance between ${\rm J}/\psi$ dissociation and regeneration in the QGP, ${\rm J}/\psi$ interaction with a dense comoving medium. Results on the production of the heavier and less bound $\psi'$ meson in Pb-Pb collisions at forward-rapidity are also presented and compared to both models and measurements performed by other experiments. At mid-rapidity we also report on ALICE unique capability to separate prompt and non-prompt ${\rm J}/\psi$ production down to low $p_{\rm T}$ ($\geq 1.5$ GeV/$c$) and thus disentangle between effects on prompt ${\rm J}/\psi$ mesons and energy loss of $b$ quarks in the QGP.Comment: 4 pages, 7 figures, Quark Matter 2015, Kobe, Japa