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arXiv · 1809.03071

Deuterons at LHC: "snowballs in hell" via hydrodynamics and hadronic afterburner

Dmytro Oliinychenko·Long-Gang Pang·Hannah Elfner·Volker Koch
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Abstract

The deuteron yield in Pb+Pb collisions at $\sqrt{s_{NN}} = 2.76$ TeV is consistent with thermal production at a freeze-out temperature of $T = 155$ MeV. The existence of deuterons with binding energy of 2.2 MeV at this temperature was described as "snowballs in hell". We provide a microscopic explanation of this phenomenon, utilizing relativistic hydrodynamics and switching to a hadronic afterburner at the above mentioned temperature of $T = 155$ MeV. The measured deuteron $p_T$-spectra and coalescence parameter $B_2(p_T)$ are reproduced without free parameters, only by implementing experimentally known cross-sections of deuteron reactions with hadrons, most importantly $πd \leftrightarrow πn p$.

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Dmytro Oliinychenko, Long-Gang Pang, Hannah Elfner, Volker Koch. 2019-04-12. Deuterons at LHC: "snowballs in hell" via hydrodynamics and hadronic afterburner. https://doi.org/10.1103/physrevc.99.044907

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