Abstract

Abstract We present the capabilities of the CMS experiment to explore the heavy-ion physics program of the CERN Large Hadron Collider (LHC). Collisions of lead nuclei at energies up to s N N = 5.5 TeV will probe quark and gluon matter at unprecedented values of energy density. 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 potential of CMS to carry out a full set of representative Pb-Pb measurements both in “soft” and “hard” regimes. Measurements include “bulk” observables — charged hadron multiplicity, low- p T inclusive identified hadron spectra and elliptic flow — which provide information on the collective properties of the system; as well as perturbative processes — such as quarkonia, heavy quarks, jets, γ–jet and high p T hadrons — which yield “tomographic” information on the hottest and densest phases of the reaction. In addition, reference measurements that have been performed on early p+p collision data will be reviewed.

Highlights

  • The study of the strong interaction in extreme temperature and density conditions has been the driving force for experiments evidence that at tfhreomenethrgeyBienvca.lmac.st.o√thse=th6e3L–2a0rg0eGHeaVdrpoenrCollider

  • The scaling of the elliptic flow with quark number, the suppression of 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 temperatures system was created [2, 3, 4]

  • In addition there is evidence that at small parton momentum fraction the initial state of the nuclei may be a sheet of gluons, the color glass condensate [5, 6]

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Summary

Introduction

The study of the strong interaction in extreme temperature and density conditions has been the driving force for experiments evidence that at tfhreomenethrgeyBienvca.lmac.st.o√thse=th6e3L–2a0rg0eGHeaVdrpoenr. The nucleon pair a RHIC experiments strongly interacting have produced the quark gluon liquid is produced [1]. The scaling of the elliptic flow with quark number, the suppression of 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 temperatures system was created [2, 3, 4]. In addition there is evidence that at small parton momentum fraction the initial state of the nuclei may be a sheet of gluons, the color glass condensate [5, 6]. The start of the heavy-ion program at the LHC with lead-lead collisions at the energy in c.m.s. The collisions should produce the hard probes such as jets, high-pT hadrons, heavy-quarks, quarkonia and large yields of the weakly interacting perturbative probes (direct photons, dileptons, Z0 and W± bosons) [8]

The CMS detector
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