Microscopic study of deuteron production in PbPb collisions at s=2.76TeV via hydrodynamics and a hadronic afterburner

Oliinychenko, Dmytro (Lawrence Berkeley National Laboratory, 1 Cyclotron Rd, Berkeley, California 94720, USA) ; Pang, Long-Gang (Lawrence Berkeley National Laboratory, 1 Cyclotron Rd, Berkeley, California 94720, USA) (Physics Department, University of California, Berkeley, California 94720, USA) ; Elfner, Hannah (Frankfurt Institute for Advanced Studies, Ruth-Moufang-Strasse 1, 60438 Frankfurt am Main, Germany) (Institute for Theoretical Physics, Goethe University, Max-von-Laue-Strasse 1, 60438 Frankfurt am Main, Germany) (GSI Helmholtzzentrum für Schwerionenforschung, Planckstr. 1, 64291 Darmstadt, Germany) ; Koch, Volker (Lawrence Berkeley National Laboratory, 1 Cyclotron Rd, Berkeley, California 94720, USA)

12 April 2019

Abstract: The deuteron yield in Pb+Pb collisions at sNN=2.76TeV is consistent with thermal production at a freeze out temperature of T=155MeV. The existence of deuterons with binding energy of 2.2 MeV at this temperature was described as “snowballs in hell” [P. Braun-Münzinger, B. Dönigus, and N. Löher, CERN Courier, August 2015]. We provide a microscopic explanation of this phenomenon, utilizing relativistic hydrodynamics and switching to a hadronic afterburner at the above-mentioned temperature of T=155MeV. The measured deuteron pT spectra and coalescence parameter B2(pT) are reproduced without free parameters, only by implementing experimentally known cross sections of deuteron reactions with hadrons, most importantly πdπnp.


Published in: Physical Review C 99 (2019)
Published by: APS
DOI: 10.1103/PhysRevC.99.044907
arXiv: 1809.03071
License: CC-BY-4.0



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