Speaker
Raphael Granier De Cassagnac
(Ecole polytechnique, CNRS-IN2P3)
Description
We present early results of the CMS experiment from PbPb collisions at $srqrt{s_{NN}}$ = 2.76 TeV, probing quark and gluon matter at unprecedented values of energy density. The capabilities of the CMS apparatus allows us to investigate various hard probes, as well as bulk particle production and collective phenomena, using the calorimetry, muon and tracking systems covering a large range in pseudorapidity, complemented by a flexible two-level trigger system. We will review the latest results among which we will highlight: 1/ Detailed jet quenching studies from unbalanced dijets, high momentum charge particle suppression, b-quark quenching though its displaced decay to J/psi, and firs measurement of fragmentation functions, 2/ Unmodified electroweak reference probes : isolated photons, Z and W bosons, 3/ Quarkonia suppression, in particular the suppression of Upsilon excited states.
