Measurement of the Pseudorapidity and Centrality Dependence of the Transverse Energy Density in Pb-Pb Collisions at  √ s NN = 2.76 TeV

S Chatrchyan; V Khachatryan; A. M Sirunyan; A. Tumasyan; W Adam; CMS Collaboration

doi:10.1103/PhysRevLett.109.152303

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Measurement of the Pseudorapidity and Centrality Dependence of the Transverse Energy Density in Pb-Pb Collisions at √ s NN = 2.76 TeV

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Measurement of the Pseudorapidity and Centrality Dependence of the Transverse Energy Density in Pb-Pb Collisions at √ s NN = 2.76 TeV

S Chatrchyan, V Khachatryan, A. M Sirunyan, A. Tumasyan, W Adam and CMS Collaboration

Physical review letters, Vol.109(15), 152303

10/02/2012

DOI: 10.1103/PhysRevLett.109.152303

PMID: 23102301

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Abstract

The transverse energy (ET) in Pb-Pb collisions at 2.76 TeV nucleon-nucleon center-of-mass energy (√sNN) has been measured over a broad range of pseudorapidity (η) and collision centrality by using the CMS detector at the LHC. The transverse energy density per unit pseudorapidity (dET/dη) 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 η=0 to |η|=5.0. For the 5% most central collisions, the energy density per unit volume is estimated to be about 14 GeV/fm3 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 √sNN=200 GeV at the Relativistic Heavy Ion Collider.

Details

Title: Subtitle: Measurement of the Pseudorapidity and Centrality Dependence of the Transverse Energy Density in Pb-Pb Collisions at √ s NN = 2.76 TeV
Creators: S Chatrchyan - Yerevan State University
V Khachatryan - A. Alikhanyan National Laboratory
A. M Sirunyan - A. Alikhanyan National Laboratory
A. Tumasyan - A. Alikhanyan National Laboratory
W Adam - Austrian Academy of Sciences
CMS Collaboration
Contributors: E. A Albayrak (Contributor) - University of Iowa, Physics and Astronomy
C. R Newsom (Contributor) - University of Iowa, Physics and Astronomy
Y Onel (Contributor) - University of Iowa, Physics and Astronomy
Resource Type: Journal article
Publication Details: Physical review letters, Vol.109(15), 152303
DOI: 10.1103/PhysRevLett.109.152303
PMID: 23102301
NLM abbreviation: Phys Rev Lett
ISSN: 0031-9007
eISSN: 1079-7114
Publisher: American Physical Society
Grant note: DOI: 10.13039/100000015, name: U.S. Department of Energy; DOI: 10.13039/100000001, name: National Science Foundation
Language: English
Date published: 10/02/2012
Academic Unit: Physics and Astronomy
Record Identifier: 9984439351602771

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