Issue |
EPJ Web Conf.
Volume 276, 2023
The 20th International Conference on Strangeness in Quark Matter (SQM 2022)
|
|
---|---|---|
Article Number | 04002 | |
Number of page(s) | 6 | |
Section | Resonances and Hyper-nuclei | |
DOI | https://doi.org/10.1051/epjconf/202327604002 | |
Published online | 01 March 2023 |
https://doi.org/10.1051/epjconf/202327604002
Hypernuclei at relativistic energies
Institut für Kernphysik, Goethe Universität Frankfurt,
Frankfurt, Germany
* e-mail: benjamin.doenigus@cern.ch
Published online: 1 March 2023
This article summarizes some of the current theoretical developments and the experimental status of hypernuclei in relativistic heavy-ion collisions and elementary collisions. In particular, the most recent results of hyperhydrogen of mass A = 3 and 4 are discussed. The highlight at SQM2022 in this perspective was the discovery of the anti-hyperhydrogen-4 by the STAR Collaboration, in a large data set consisting of different collision systems. Furthermore, the production yields of hyperhydrogen-4 and hyperhelium-4 from the STAR Collaboration can be described nicely by the thermal model when the excited states of these hypernuclei are taken into account. In contrast, the production measurements in small systems (pp and p–Pb) from the ALICE Collaboration tends to favour the coalescence model over the thermal description. New measurements from STAR, ALICE and HADES Collaborations of the properties, e.g. lifetime, of A = 3 and 4 hypernuclei give similar results of these properties. Also the anti-hyperhydrogen-4 lifetime is in rather good agreement with previous measurements. Interestingly, the new STAR measurement on the R3 value, that is connected to the branching ratio, points to a Λ separation energy that is below 100 keV but definitely consistent with the value of 130 keV assumed since the 70s.
© The Authors, published by EDP Sciences, 2023
This is an Open Access article distributed under the terms of the Creative Commons Attribution License 4.0 (http://creativecommons.org/licenses/by/4.0/).
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