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Please use this identifier to cite or link to this item: http://acervodigital.unesp.br/handle/11449/24571
Title: 
Indications of Suppression of Excited Upsilon States in Pb-Pb Collisions at root(NN)-N-s=2.76 TeV
Author(s): 
Institution: 
  • Yerevan Phys Inst
  • Inst Hochenergiephys OeAW
  • Natl Ctr Particle & High Energy Phys
  • Univ Antwerp
  • Vrije Univ Brussel
  • Univ Libre Brussels
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  • Catholic Univ Louvain
  • Univ Mons
  • Centro Brasileiro de Pesquisas Físicas (CBPF)
  • Univ Estado Rio de Janeiro
  • Scuola Normale Super Pisa
  • Ist Nazl Fis Nucl
  • Univ Roma La Sapienza
  • Univ Turin
  • Univ Piemonte Orientale Novara
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  • University of Belgrade
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  • Ctr Invest & Estudios Avanzados IPN
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ISSN: 
0031-9007
Sponsorship: 
  • Marie-Curie programme
  • European Research Council (European Union)
  • Leventis Foundation
  • A. P. Sloan Foundation
  • Alexander von Humboldt Foundation
  • Associazione per lo Sviluppo Scientifico e Tecnologico del Piemonte (Italy)
  • Belgian Federal Science Policy Office
  • Fonds pour la Formation a la Recherche dans l'industrie et dans l'Agriculture (FRIA-Belgium)
  • Agentschap voor Innovatie door Wetenschap en Technologie (IWT)
Abstract: 
A comparison of the relative yields of Upsilon resonances in the mu(+)mu(-) 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 Upsilon(2S) and Upsilon(3S) excited states to the Upsilon(1S) ground state in Pb-Pb and pp collisions, [Upsilon(2S + 3S)/Upsilon(1S)](Pb-Pb) /[Upsilon 2S + 3S)/Upsilon(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%.
Issue Date: 
28-Jul-2011
Citation: 
Physical Review Letters. College Pk: Amer Physical Soc, v. 107, n. 5, p. 15, 2011.
Time Duration: 
15
Publisher: 
Amer Physical Soc
Source: 
http://dx.doi.org/10.1103/PhysRevLett.107.052302
URI: 
http://hdl.handle.net/11449/24571
Access Rights: 
Acesso aberto
Type: 
outro
Source:
http://repositorio.unesp.br/handle/11449/24571
Appears in Collections:Artigos, TCCs, Teses e Dissertações da Unesp

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