Microscopic study of deuteron production in PbPb collisions at s = 2.76 TeV via hydrodynamics and a 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 $T = 155$ MeV. The existence of deuterons with binding energy of 2.2 MeV at this temperature was described as "snowballs in hell". We provide a microsco...
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Veröffentlicht in: | Physical review. C 2019-04, Vol.99 (4), Article 044907 |
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Format: | Artikel |
Sprache: | eng |
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Zusammenfassung: | 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 $\pi d \leftrightarrow \pi n p$. |
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ISSN: | 2469-9985 2469-9993 |
DOI: | 10.1103/PhysRevC.99.044907 |