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Indications of suppression of excited Υ states in Pb-Pb collisions at √(s(NN))=2.76 TeV.

Abstract:

A 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....

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Journal:
Phys Rev Lett
Volume:
107
Issue:
5
Pages:
052302
Publication date:
2011-07-29
DOI:
EISSN:
1079-7114
ISSN:
0031-9007
Source identifiers:
172519
Language:
English
Pubs id:
pubs:172519
UUID:
uuid:7eed91f9-8dca-4ac5-94b0-84d3bdbccef0
Local pid:
pubs:172519
Deposit date:
2013-11-16

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