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Proceedings 2019, 10(1), 6; https://doi.org/10.3390/proceedings2019010006

Centrality Dependence of Deuteron Production in PbPb Collisions at 2.76 TeV via Hydrodynamics and Hadronic Afterburner +

1
Lawrence Berkeley National Laboratory, 1 Cyclotron Rd, Berkeley, CA 94720, USA
2
Physics Department, University of California, Berkeley, CA 94720, USA
3
GSI Helmholtzzentrum für Schwerionenforschung, Planckstr. 1, 64291 Darmstadt, Germany
4
Institute for Theoretical Physics, Goethe University, Max-von-Laue-Strasse 1, 60438 Frankfurt am Main, Germany
5
Frankfurt Institute for Advanced Studies, Ruth-Moufang-Strasse 1, 60438 Frankfurt am Main, Germany
*
Author to whom correspondence should be addressed.
Presented at Hot Quarks 2018—Workshop for young scientists on the physics of ultrarelativistic nucleus-nucleus collisions, Texel, The Netherlands, 7–14 September 2018.
Published: 10 April 2019
PDF [374 KB, uploaded 10 April 2019]

Abstract

The deuteron binding energy is only 2.2 MeV. At the same time, its yield in Pb+Pb collisions
at
p
sNN = 2.76 TeV corresponds to a thermal yield at the temperature around 155 MeV, which is too
hot to keep deuterons bound. This puzzle is not completely resolved yet. In general, the mechanism of
light nuclei production in ultra-high energy heavy ion collisions remains under debate. In a previous
work we suggest a microscopic explanation of the deuteron production in central ultra-relativistic
Pb+Pb collisions, the main mechanism being ppn $ pd reactions in the hadronic phase of the
collision. We use a state-of-the-art hybrid approach, combining relativistic hydrodynamics for the hot
and dense stage and hadronic transport for a later, more dilute stage. Deuteron rescattering in the
hadronic stage is implemented explicitly, using its experimentally measured vacuum cross-sections.
In these proceedings we extend our previous work to non-central collisions, keeping exactly the
same methodology and parameters. We find that our approach leads to a good description of the
measured deuteron transverse momentum spectra at centralities up to 40%, and underestimates
the amount of deuterons at low transverse momentum at higher centralities. Nevertheless, the
coalescence parameter B2, measured by ALICE collaboration, is reproduced well in our approach
even for peripheral collisions.
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited (CC BY 4.0).
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Oliinychenko, D.; Pang, L.-G.; Elfner, H.; Koch, V. Centrality Dependence of Deuteron Production in PbPb Collisions at 2.76 TeV via Hydrodynamics and Hadronic Afterburner +. Proceedings 2019, 10, 6.

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