| Issue |
EPJ Web Conf.
Volume 259, 2022
The 19th International Conference of Strangeness in Quark Matter (SQM 2021)
|
|
|---|---|---|
| Article Number | 12007 | |
| Number of page(s) | 4 | |
| Section | Heavy-Flavor (Parallel) | |
| DOI | https://doi.org/10.1051/epjconf/202225912007 | |
| Published online | 01 February 2022 | |
https://doi.org/10.1051/epjconf/202225912007
Evidence for X(3872) in PbPb collisions and studies of its prompt production at √SNN = 5.02 TeV with CMS
1 Massachusetts Institute of Technology
* e-mail: yenjie@mit.edu
Published online: 1 February 2022
The first evidence for X(3872) production in relativistic heavy ion collisions, with a significance of 4.2 standard deviations, is reported. The X(3872) production is studied in lead-lead (PbPb) collisions at a center-of-mass energy of √SNN = 5.02 TeV per nucleon pair with the CMS detector. The measurement is performed in the rapidity and transverse momentum ranges |y| < 1.6 and 15 < pT < 50 GeV/c. The prompt X(3872) to ψ(2S) yield ratio is found to be ρPbPb = 1.08 ± 0.49(stat.) ± 0.52(syst.), to be compared with typical values of 0.1 for pp collisions. This provides new input to theoretical models of the X(3872) production mechanism, and of the nature of this exotic state.
© The Authors, published by EDP Sciences, 2022
This is an Open Access article distributed under the terms of the Creative Commons Attribution License 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.