Bonn 2020 – wissenschaftliches Programm
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HK 43.1: Gruppenbericht
Donnerstag, 2. April 2020, 14:00–14:30, J-HS F
Measurement of the production of light (hyper-)nuclei and their antiparticles with ALICE at the LHC — •Sebastian Hornung for the ALICE collaboration — Ruprecht-Karls-Universität, Heidelberg, Deutschland — GSI Helmholtzzentrum für Schwerionenforschung, Darmstadt, Deutschland
The production mechanism of (anti-)nuclei and (anti-)hypernuclei in high-energy hadronic collisions is one of the open puzzles in high-energy physics. On the one hand, the yields can be described by statistical hadronization models. On the other hand, the production of nuclei can be explained by the coalescence of protons and neutrons which are close by in phase space. Studies of the light (anti-)nuclei production as a function of the charged-particle multiplicity density provide an important insight into the system-size dependence of the formation of multi-baryon states. The information drawn from the yields and spectra are complemented by the measurement of the momentum space anisotropies in the emission of nuclei. Further, the measurements of the lifetime and binding energy of (anti-)hypertriton can be used to study the interaction of hyperons with nucleons.
The measurement of (hyper-)nuclei is experimentally challenging due to the low production rates and the contamination by secondary nuclei produced in spallation reactions with the beam pipe or the detector material. An overview of recent ALICE results on the production of light (anti-)nuclei and the lifetime of (anti-)hypertriton will be presented.