Title
|
|
|
|
Indications of suppression of excited states in Pb-Pb collisions at = 2.76 TeV
| |
Author
|
|
|
|
| |
Institution/Organisation
|
|
|
|
CMS Collaboration
| |
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+0.19(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%. |
| |
Language
|
|
|
|
English
| |
Source (journal)
|
|
|
|
Physical review letters. - New York, N.Y., 1958, currens
| |
Publication
|
|
|
|
New York, N.Y.
:
American Physical Society
,
2011
| |
ISSN
|
|
|
|
0031-9007
[print]
1079-7114
[online]
| |
DOI
|
|
|
|
10.1103/PHYSREVLETT.107.052302
| |
Volume/pages
|
|
|
|
107
:5
(2011)
, p. 1-15
| |
Article Reference
|
|
|
|
052302
| |
ISI
|
|
|
|
000293250300006
| |
Medium
|
|
|
|
E-only publicatie
| |
Full text (Publisher's DOI)
|
|
|
|
| |
Full text (open access)
|
|
|
|
| |
|