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Title

Indications of Suppression of Excited Υ States in Pb-Pb Collisions at √sNN=2.76  TeV

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 ; Matorras, Francisco ; Muñoz Sánchez, F. J. ; Piedra, Jonatan ; Rodrigo, Teresa ; Rodríguez Marrero, Ana Y. ; Ruiz Jimeno, Alberto ; Scodellaro, Luca ; Sobron Sañudo, M. ; Vila, Iván ; Vilar, Rocío
Issue Date2011
PublisherAmerican Physical Society
CitationPhysical Review Letters 107(5): 052302 (2011)
AbstractA comparison of the relative yields of Υ resonances in the μ+μ- decay channel in Pb-Pb and pp collisions at a center-of-mass energy per nucleon pair of 2.76 TeV is performed with data collected with the CMS detector at the LHC. Using muons of transverse momentum above 4  GeV/c and pseudorapidity below 2.4, the double ratio of the Υ(2S) and Υ(3S) excited states to the Υ(1S) ground state in Pb-Pb and pp collisions, [Υ(2S+3S)/Υ(1S)]Pb-Pb/[Υ(2S+3S)/Υ(1S)]pp, is found to be 0.31-0.15+0.19(stat)±0.03(syst). The probability to obtain the measured value, or lower, if the true double ratio is unity, is calculated to be less than 1%.
Description15 páginas, 1 figura.-- PACS numbers: 25.75.Nq, 14.40.Pq.-- License Creative Commons Attribution 3.0.-- CMS Collaboration: et al.
Publisher version (URL)http://dx.doi.org/10.1103/PhysRevLett.107.052302
URIhttp://hdl.handle.net/10261/46144
DOI10.1103/PhysRevLett.107.052302
ISSN0031-9007
E-ISSN1079-7114
Appears in Collections:(IFCA) Artículos
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