Measurement of the pseudorapidity and centrality dependence of the transverse energy density in PbPb collisions at sqrt(s[NN]) = 2.76 TeV

Abstract

The transverse energy ET in PbPb collisions at 2.76 TeV nucleon-nucleon center-of-mass energy sqrt(s[NN]) has been measured over a broad range of pseudorapidity eta and collision centrality using the CMS detector at the LHC. The transverse energy density per unit pseudorapidity d(ET)/d(eta) increases faster with collision energy than the charged particle multiplicity. This implies that the mean energy per particle is increasing with collision energy. At all pseudorapidities the transverse energy per participating nucleon increases with the centrality of the collision. The ratio of transverse energy per unit pseudorapidity in peripheral to central collisions varies significantly as the pseudorapidity increases from eta = 0 to abs(eta) = 5.0. For the 5% most central collisions the energy density per unit volume is estimated to be about 14 GeV/fm^3 at a time of 1 fm/c after the collision. This is about 100 times larger than normal nuclear matter density and a factor of 2.6 times higher than the energy density reported at sqrt(s[NN]) = 200 GeV at RHIC.

Submitted to Physical Review Letters

References in corpus (5)

• Glauber Modeling in High Energy Nuclear Collisions
• Forward Neutral Pion Production in p+p and d+Au Collisions at sqrt(s_NN)=200 GeV
• The eccentricity in heavy-ion collisions from Color Glass Condensate initial conditions
• The PHOBOS Glauber Monte Carlo
• Landau Hydrodynamics Reexamined

Cited by in corpus (24)

• CGC predictions for p+Pb collisions at the LHC
• The Muon Puzzle in cosmic-ray induced air showers and its connection to the Large Hadron Collider
• Phenomenological Review on Quark-Gluon Plasma: Concepts vs. Observations
• An overview of the experimental study of quark-gluon matter in high-energy nucleus-nucleus collisions
• An overview of experimental results from ultra-relativistic heavy-ion collisions at the CERN LHC: bulk properties and dynamical evolution
• Effective-energy budget in multiparticle production in nuclear collisions
• Hadron spectra, flow and correlations in PbPb collisions at the LHC: interplay between soft and hard physics
• The emission of electromagnetic radiation from the early stages of relativistic heavy-ion collisions
• Gravitational collisions and the quark-gluon plasma
• Heavy-ion physics studies for the Future Circular Collider
• Charged Particle and Photon Multiplicity, and Transverse Energy Production in High-Energy Heavy-Ion Collisions
• Colour screening scenario for quarkonia suppression in a quasiparticle model compared with data obtained from experiments at the CERN SPS, BNL RHIC, and CERN LHC
• Kenneth Wilson and lattice QCD
• Performance of the CMS Zero Degree Calorimeters in pPb collisions at the LHC
• Systematic study of the Chiral Magnetic Effect with the AVFD model at LHC energies
• Thermodynamic and Transport Properties of Matter Formed in $pp$, $p$-Pb, Xe-Xe and Pb-Pb Collisions at the Large Hadron Collider using Color String Percolation Model
• Search for the Chiral Magnetic Effect with charge-dependent azimuthal correlations in Xe-Xe collisions at $\sqrt{s_{\mathrm{NN}}}=5.44$ TeV
• Inclusive heavy-flavour production at central and forward rapidity in Xe-Xe collisions at $\sqrt{s_{\mathrm{NN}}}=5.44$ TeV
• Bremsstrahlung as a probe of baryon stopping in heavy-ion collisions
• Measurement of the transverse energy density in Au+Au collisions at $\sqrt{s_{NN}}=200$ GeV with the sPHENIX detector
• Perturbative probes of QCD matter at the Large Hadron Collider
• Introduction to the Quark-Gluon Plasma session in RJC 2014
• Junction conditions and sharp gradients in generalized coupling theories
• Multiparticle production in nuclear collisions using effective-energy approach