Evidence for X(3872) in PbPb collisions and studies of its prompt production at √SNN = 5.02 TeV with CMS
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$\sqrt {{S_{{\rm{NN}}}}} = 5.02\,{\rm{TeV}}$SNN=5...
| Main Author: | |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
EDP Sciences
2022-01-01
|
| Series: | EPJ Web of Conferences |
| Online Access: | https://www.epj-conferences.org/articles/epjconf/pdf/2022/03/epjconf_sqm2021_12007.pdf |
| Summary: | 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$\sqrt {{S_{{\rm{NN}}}}} = 5.02\,{\rm{TeV}}$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. |
|---|---|
| ISSN: | 2100-014X |