Suppression of excited Υ states relative to the ground state in PbPb collisions at √sNN = 5.02TeV

CMS Collaboration, Shimaa Abu Zeid, Freya Blekman, Jorgen D'Hondt, Isabelle Helena De Bruyn, Kevin Deroover, Steven Lowette, Seth Moortgat, Lieselotte Moreels, Quentin Python, Kirill Skovpen, Stefaan Tavernier, Walter Van Doninck, Petra Van Mulders, Isis Marina Van Parijs, Annik Olbrechts, Nadir Daci

Research output: Contribution to journalArticlepeer-review

48 Citations (Scopus)


The relative yields of Υ mesons produced in pp and PbPb collisions at √sNN = 5.02TeV 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 PbPb and pp collisions at the same center-of-mass energy. The double ratios, [Υ(nS)/Υ(1S)]PbPb/[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 PbPb 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.

Original languageEnglish
Article number142301
Number of pages17
JournalPhysical Review Letters
Issue number14
Publication statusPublished - 2 Apr 2018


Dive into the research topics of 'Suppression of excited Υ states relative to the ground state in PbPb collisions at √sNN = 5.02TeV'. Together they form a unique fingerprint.

Cite this