Chatrchyan, S. ; Mondal, N. K. ; et, al (2011) Indications of suppression of excited γ states in Pb-Pb Collisions at √SNN=2.76 TeV Physical Review Letters, 107 (5). 052302_1-052302_15. ISSN 0031-9007
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Official URL: http://prl.aps.org/abstract/PRL/v107/i5/e052302
Related URL: http://dx.doi.org/10.1103/PhysRevLett.107.052302
Abstract
A comparison of the relative yields of γ 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 γ(2S) and γ(3S) excited states to the γ(1S) ground state in Pb-Pb and pp collisions, [γ(2S+3S)/γ(1S)]Pb-Pb/[γ(2S+3S)/γ(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%.
| Item Type: | Article |
|---|---|
| Source: | Copyright of this article belongs to The American Physical Society. |
| ID Code: | 76204 |
| Deposited On: | 31 Dec 2011 08:24 |
| Last Modified: | 31 Dec 2011 08:24 |
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