Sirunyan, AM;
Tumasyan, A;
Adam, W;
Asilar, E;
Bergauer, T;
Brandstetter, J;
Brondolin, E;
... Woods, N; + view all
(2018)
Suppression of Excited gamma States Relative to the Ground State in Pb-Pb Collisions at root s(NN)=5.02 TeV.
Physical Review Letters
, 120
(14)
, Article 142301. 10.1103/PhysRevLett.120.142301.
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Abstract
The relative yields of Υ mesons produced in pp and Pb-Pb collisions at √sNN = 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, Υ(2S) and Υ(3S), to the ground state, Υ (1S), in both Pb-Pb and pp collisions at the same center-of-mass energy. The double ratios, [Υ(nS) /Υ(1S)] Pb − Pb/[Υ (nS)/Υ (1S)]pp, are measured to be 0.308 ± 0.055 (stat) ± 0.019 (syst) for the Υ(2S) and less than 0.26 at 95% confidence level for the Υ (3S). No significant Υ(3S) 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.
| Type: | Article |
|---|---|
| Title: | Suppression of Excited gamma States Relative to the Ground State in Pb-Pb Collisions at root s(NN)=5.02 TeV |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1103/PhysRevLett.120.142301 |
| Publisher version: | https://doi.org/0.1103/PhysRevLett.120.142301 |
| Language: | English |
| Additional information: | © 2018 CERN, for the CMS Collaboration. Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. Funded by SCOAP3. |
| Keywords: | Jets & heavy flavor physics, QCD in nuclear reactions, Quark-gluon plasma, Bottom mesons |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences |
| URI: | https://discovery-pp.ucl.ac.uk/id/eprint/10074304 |
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