Abstract
Abstract We present the first results on PbPb collisions at S N N = 2.76 TeV with the CMS experiment at the LHC. This is a huge energy jump of a factor of 14 over RHIC creating the hottest matter ever produced in a laboratory. The prime goal of this research is to study the fundamental theory of the strong interaction (QCD) in extreme conditions of temperature, density and parton momentum fraction. We give an overview of the measurements by CMS in PbPb collisions both in “soft” and “hard” regimes. The first results on the reconstruction of jets, Z and quarkonia are described. These signals are the probes of the hottest and densest phases of the reaction. Also, an overview of the bulk observables such as charged hadron multiplicity, low p T inclusive hadron identified spectra and elliptic flow which provide information on the collective properties of the system is given.
Highlights
The study of the strong interaction in extreme temperature and density conditions has been the driving force for experiments from the Bevalac to the the Large√Hadron Collider
The prime goal of this research is to study the fundamental theory of the strong interaction (QCD) in extreme conditions of temperature, density and parton momentum fraction
The scaling of elliptic flow with quark number, and the suppression of the fast quarks in the medium are clear signals of this. At both SPS and RHIC energies the suppression of the J/ψ resonance suggests that a very high temperature system was created [2,3]
Summary
The study of the strong interaction in extreme temperature and density conditions has been the driving force for experiments from the Bevalac to the the Large√Hadron Collider. The RHIC experiments have produced the evidence that at the energy sNN = 200 GeV a strongly interacting quark gluon liquid is produced [1]. The scaling of elliptic flow with quark number, and the suppression of the fast quarks in the medium are clear signals of this At both SPS and RHIC energies the suppression of the J/ψ resonance suggests that a very high temperature system was created [2,3]. The second heavy-ion run is expected in November-December 2011 at the same or slightly higher energ√y but with an increase in luminosity. In 2013-14, the plan is to collide Pb nuclei at sNN = 5.5 TeV which is 28 times higher than the highest energy available at RHIC
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