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
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 $\pi \text{d} \leftrightarrow \pi \text{n}
\text{p}$.