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

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English: 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 πd↔πnp.
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https://journals.aps.org/prc/abstract/10.1103/PhysRevC.99.044907

https://doi.org/10.1103/PhysRevC.99.044907
Author Dmytro Oliinychenko, Long-Gang Pang, Hannah Elfner, and Volker Koch

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