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Paper   IPM / Particles / 12410
School of Particles and Accelerator
Title:   Measurement of the pseudorapidity and centrality dependence of the transverse energy density in PbPb collisions at sqrt(s[NN]) = 2.76 TeV
Author(s):
 1 Hessamadin Arfaei 2 Hamed Bakhshiansohi 3 Seyed Mohsen Etesami 4 Ali Fahim 5 Majid Hashemi 6 Hoda Hesari 7 Abideh Jafari 8 Mohsen Khakzad 9 A Mohammadi 10 Mojtaba Mohammadi Najafabadi 11 Saeid Paktinat 12 Batool Safarzadeh 13 Maryam Zeinali
Status:   Published
Journal: Phys. Rev. Lett.
No.:  152303
Vol.:  109
Year:  2012
Supported by:  IPM
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 most central collisions the energy density per unit volume is estimated to be about 15 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 2.8 times higher than the energy density reported at sqrt(s[NN]) = 200 GeV at RHIC