Production of light nuclei in heavy ion collisions via hagedorn resonances

  • The physical processes behind the production of light nuclei in heavy ion collisions are unclear. The successful theoretical description of experimental yields by thermal models conflicts with the very small binding energies of the observed states, being fragile in such a hot and dense environment. Other available ideas are delayed production via coalescence, or a cooling of the system after the chemical freeze-out according to a Saha equation, or a ‘quench’ instead of a thermal freeze-out. A recently derived prescription of an (interacting) Hagedorn gas is applied to consolidate the above pictures. The tabulation of decay rates of Hagedorn states into light nuclei allows to calculate yields usually inaccessible due to very poor Monte Carlo statistics. Decay yields of stable hadrons and light nuclei are calculated. While the scale-free decays of Hagedorn states alone are not compatible with the experimental data, a thermalized hadron and Hagedorn state gas is able to describe the experimental data. Applying a cooling of the system according to a Saha-equation with conservation of nucleon and anti-nucleon numbers leads to (nearly) temperature independent yields, thus a production of the light nuclei at temperatures much lower than the chemical freeze-out temperature is compatible with experimental data and with the statistical hadronization model.

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Author:Kai GallmeisterORCiD, Carsten GreinerGND
Parent Title (English):The European physical journal A
Place of publication:Berlin ; Heidelberg
Document Type:Article
Date of Publication (online):2021/02/17
Date of first Publication:2021/02/17
Publishing Institution:Universitätsbibliothek Johann Christian Senckenberg
Release Date:2022/10/21
Article Number:62
Page Number:8
First Page:1
Last Page:8
This work was supported by the Bundesministerium für Bildung und Forschung (BMBF), Grant No. 3313040033. Open Access funding enabled and organized by Projekt DEAL.
Institutes:Physik / Physik
Dewey Decimal Classification:5 Naturwissenschaften und Mathematik / 53 Physik / 530 Physik
Licence (German):License LogoCreative Commons - Namensnennung 4.0