Evidence for X(3872) in Pb-Pb collisions and studies of its prompt production at sqrt[s_{NN}]=5.02 TeV.
File(s)
Published version
Author(s)
Type
Journal Article
Abstract
The first evidence for X(3872) production in relativistic heavy ion collisions is reported. The X(3872) production is studied in lead-lead (Pb-Pb) collisions at a center-of-mass energy of sqrt[s_{NN}]=5.02 TeV per nucleon pair, using the decay chain X(3872)→J/ψπ^{+}π^{-}→μ^{+}μ^{-}π^{+}π^{-}. The data were recorded with the CMS detector in 2018 and correspond to an integrated luminosity of 1.7 nb^{-1}. The measurement is performed in the rapidity and transverse momentum ranges |y|<1.6 and 15<p_{T}<50 GeV/c. The significance of the inclusive X(3872) signal is 4.2 standard deviations. The prompt X(3872) to ψ2S yield ratio is found to be ρ^{Pb-Pb}=1.08±0.49(stat)±0.52(syst), to be compared with typical values of 0.1 for pp collisions. This result provides a unique experimental input to theoretical models of the X(3872) production mechanism, and of the nature of this exotic state.
Date Issued
2022-01-21
Date Acceptance
2021-12-22
Citation
Physical Review Letters, 2022, 128 (3), pp.1-18
ISSN
0031-9007
Publisher
American Physical Society
Start Page
1
End Page
18
Journal / Book Title
Physical Review Letters
Volume
128
Issue
3
Copyright Statement
© 2022 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.
License URL
Identifier
https://www.ncbi.nlm.nih.gov/pubmed/35119878
Subjects
CMS Collaboration
hep-ex
hep-ex
nucl-ex
General Physics
01 Mathematical Sciences
02 Physical Sciences
09 Engineering
Publication Status
Published
Coverage Spatial
United States
Date Publish Online
2022-01-19