Report number
| ATL-PHYS-PROC-2016-255 |
Title
| J/ψ and ψ(2S) production in pp and PbPb collisions at 5.02 TeV with ATLAS |
Author(s)
| Tapia Araya, Sebastian (Universidad Tecnica Federico Santa Maria) (+) |
Corporate
Author(s)
| The ATLAS collaboration |
Collaboration
| ATLAS Collaboration |
Publication
| 2017 |
Imprint
| 06 Dec 2016 |
Number of pages
| 4 |
In:
| Nucl. Part. Phys. Proc. 289-290 (2017) 393-396 |
In:
| The 8th International Conference on Hard and Electromagnetic Probes of High-energy Nuclear Collisions, Wuhan, China, 23 - 27 Sep 2016, pp.393-396 |
DOI
| 10.1016/j.nuclphysbps.2017.05.091
|
Subject category
| Particle Physics - Experiment |
Accelerator/Facility, Experiment
| CERN LHC ; ATLAS |
Free keywords
| HEAVYIONS |
Abstract
| A measurement of J/ψ and ψ(2S) production is presented. It is based on data from lead-lead collisions at √sNN=5.02 TeV and pp collisions at √s=5.02 TeV recorded by the ATLAS detector at the LHC in 2015, corresponding to integrated luminosities of 0.49 nb−1 and 25 pb−1 in Pb+Pb and pp, respectively. The measurements of differential cross sections, nuclear modification factors, and non-prompt fractions were performed in the dimuon decay channel. A strong suppression was found for both prompt and non-prompt J/ψ, as well as for prompt and non-prompt ψ(2S), becoming more pronounced with increasing event centrality. The suppression of prompt ψ(2S) was observed to be stronger than that of J/ψ, while the suppression of non-prompt ψ(2S) was equal to that of the non-prompt J/ψ within uncertainties, consistent with the expectation that both arise from b-quarks propagating through the medium. The dependence of nuclear modification factors with centrality for prompt and non-prompt J/ψ was found to have a similar form, despite the quite different physical origins expected to have given rise to their production: a composite meson formed within the medium and a b-quark propagating through and out of the medium, respectively. |
Copyright/License
| Elsevier B.V. Preprint: (License: CC-BY-4.0) |