Suppression of Excited Ï States Relative to the Ground State in Pb-Pb Collisions at sqrt[s]_{NN}=5.02 TeV.
Phys Rev Lett
; 120(14): 142301, 2018 Apr 06.
Article
de En
| MEDLINE
| ID: mdl-29694144
ABSTRACT
The relative yields of Ï mesons produced in pp and Pb-Pb collisions at sqrt[s_{NN}]=5.02 TeV and reconstructed via the dimuon decay channel are measured using data collected by the CMS experiment. Double ratios are formed by comparing the yields of the excited states, Ï(2S) and Ï(3S), to the ground state, Ï(1S), in both Pb-Pb and pp collisions at the same center-of-mass energy. The double ratios, [Ï(nS)/Ï(1S)]_{Pb-Pb}/[Ï(nS)/Ï(1S)]_{pp}, are measured to be 0.308±0.055(stat)±0.019(syst) for the Ï(2S) and less than 0.26 at 95% confidence level for the Ï(3S). No significant Ï(3S) signal is found in the Pb-Pb data. The double ratios are studied as a function of collision centrality, as well as Ï transverse momentum and rapidity. No significant dependencies are observed.
Texte intégral:
1
Collection:
01-internacional
Base de données:
MEDLINE
Langue:
En
Journal:
Phys Rev Lett
Année:
2018
Type de document:
Article
Pays d'affiliation:
Arménie