CERN Accelerating science

ATLAS Note
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 nb1 and 25 pb1 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)

Corresponding record in: Inspire


 Записът е създаден на 2016-12-06, последна промяна на 2018-05-29


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