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Title

Measurement of the pseudorapidity and centrality dependence of the transverse energy density in Pb-Pb collisions at √s NN=2.76TeV

AuthorsChatrchyan, S.; Brochero Cifuentes, J. A. ; Cabrillo, I. J. ; Calderon, Alicia ; Chuang, S. H. ; Duarte Campderros, J. ; Felcini, Marta ; Fernández, M. ; Gómez, G. ; González Sánchez, J. ; Jorda, C. ; Lobelle Pardo, P. ; López Virto, A. ; Marco, Jesús ; Marco, Rafael ; Martínez-Rivero, Celso ; Martínez-Rivero, Celso ; Matorras, Francisco ; Muñoz Sánchez, F. J. ; Rodrigo, Teresa ; Rodríguez Marrero, Ana Y. ; Ruiz Jimeno, Alberto ; Scodellaro, Luca ; Sobron Sañudo, M. ; Vila, Iván ; Vilar, Rocío ; CMS Collaboration
Issue Date2012
PublisherAmerican Physical Society
CitationPhysical Review Letters 109: 152303 (2012)
AbstractThe transverse energy (E T) in Pb-Pb collisions at 2.76 TeV nucleon-nucleon center-of-mass energy (√s NN) 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 (dE T/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 14GeV/fm3 at a time of 1fm/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 √s NN=200GeV at the Relativistic Heavy Ion Collider.
Publisher version (URL)http://dx.doi.org/10.1103/PhysRevLett.109.152303
URIhttp://hdl.handle.net/10261/108926
DOI10.1103/PhysRevLett.109.152303
Identifiersdoi: 10.1103/PhysRevLett.109.152303
issn: 0031-9007
e-issn: 1079-7114
Appears in Collections:(IFCA) Artículos
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