Gießen 2024 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 44: Heavy-Ion Collisions and QCD Phases IX

HK 44.4: Vortrag

Mittwoch, 13. März 2024, 16:30–16:45, HBR 62: EG 03

Measurement of A=4 (anti-)hypernuclei production in heavy-ion collisions at the LHC — •Janik Ditzel — Institut für Kernphysik, Goethe-Universität, Frankfurt, Germany

At the Large Hadron Collider at CERN, light (anti-)hypernuclei are produced abundantly in Pb-Pb collisions. The production of such (anti-)hypernuclei has recently become a topic of high interest, connecting for instance to the possible strangeness content in neutron stars. The most prominent example is the (anti-)hypertriton, which is a bound state of a proton, a neutron and a Λ hyperon and the main (anti-)hypernucleus to study at the LHC. Nevertheless, there are heavier (anti-)hypernuclei whose production yields are suppressed with respect to the (anti-)hypertriton. However, they could give further insights into the formation mechanism and the nature of the hyperon-nucleon or hyperon-hyperon interaction. The existence of excited states of the two A=4 (anti-)hypernuclei makes their measurement in heavy-ion collisions in the investigated dataset become feasible. These (anti-)hypernuclei decay weakly after a few centimeters into two or more daughter particles and are reconstructed by their decay products. With the excellent performance of the ALICE apparatus, a clear particle identification of the daughters and a precise reconstruction of the decay vertex is possible. We will present new results on the measurement of (anti-)hypernuclei within the A = 4 mass region, namely the (anti-)hyperhydrogen-4 and the (anti-)hyperhelium-4.

Keywords: Hypernuclei; Heavy-Ion Collisions