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The deuteron yield in Pb+Pb collisions at $\sqrt{s_{NN}} = 2.76$ TeV isconsistent with thermal production at a freeze-out temperature of $T = 155$MeV. The existence of deuterons with binding energy of 2.2 MeV at thistemperature was described as "snowballs in hell". We provide a microscopicexplanation of this phenomenon, utilizing relativistic hydrodynamics andswitching 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 implementingexperimentally known cross-sections of deuteron reactions with hadrons, mostimportantly $\pi d \leftrightarrow \pi n p$.

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