# Transport Meeting

Venue: Institute for Theoretical Physics, Goethe University Frankfurt, Physics Building, PHYS 2.116
Time: Thursday, October 04, 2pm (s.t.)
Contact: hees@th.physik.uni-frankfurt.de

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

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 $T = 155 \, \text{MeV}$. The existence of deuterons with a binding energy of 2.2 MeV at this temperature was described as "snowballs in hell". I provide a microscopic explanation of this phenomenon, utilizing relativistic hydrodynamics and switching to a hadronic afterburner at the above mentioned temperature of $T = 155 \, \text{MeV}$. The measured deuteron $p_{\text{T}}$-spectra and coalescence parameter $B_2(p_{\text{T}})$ are reproduced without free parameters, only by implementing experimentally known cross-sections of deuteron reactions with hadrons, most importantly $\pi \text{d} \leftrightarrow \pi \text{n} \text{p}$.

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