Suppression of excited states relative to the ground state in Pb-Pb collisions at s NN=5.02 TeV
The relative yields of ϒ mesons produced in pp and Pb-Pb collisions at ffiffiffiffiffiffiffi sNN p ¼ 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, ϒð2SÞ and ϒ...
| Main Authors: | , , , , , |
|---|---|
| Format: | Article |
| Language: | English English |
| Published: |
American Physical Society
2018
|
| Subjects: | |
| Online Access: | http://irep.iium.edu.my/65281/ http://irep.iium.edu.my/65281/ http://irep.iium.edu.my/65281/ http://irep.iium.edu.my/65281/1/65281_Suppression%20of%20Excited%20%CF%92%20States%20Relative%20_article.pdf http://irep.iium.edu.my/65281/2/65281_Suppression%20of%20Excited%20%CF%92%20States%20Relative%20_scopus.pdf |
| Summary: | The relative yields of ϒ mesons produced in pp and Pb-Pb collisions at ffiffiffiffiffiffiffi
sNN p ¼ 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, ϒð2SÞ and ϒð3SÞ, to the ground
state, ϒð1SÞ, in both Pb-Pb and pp collisions at the same center-of-mass energy. The double ratios,
½ϒðnSÞ/ϒð1SÞPb−Pb/½ϒðnSÞ/ϒð1SÞpp, are measured to be 0.308 0.055ðstatÞ 0.019ðsystÞ for the
ϒð2SÞ and less than 0.26 at 95% confidence level for the ϒð3SÞ. No significant ϒð3SÞ signal is found
in the Pb-Pb data. The double ratios are studied as a function of collision centrality, as well as ϒ transverse
momentum and rapidity. No significant dependencies are observed. |
|---|