Bochum 2018 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 23: Heavy Ion Collisions and QCD Phases IV
HK 23.5: Vortrag
Dienstag, 27. Februar 2018, 17:45–18:00, HZO 60
Measurement of the pT-differential yield of (Anti-)3He in p–Pb collisions at √sNN=5.023 TeV with ALICE — •Sebastian Hornung for the ALICE collaboration — GSI Helmholtzzentrum für Schwerionenforschung GmbH, Darmstadt, Germany — Heidelberg University, Germany
The production mechanism of light (anti-)nuclei in ultra-relativistic hadron collisions is one of the open puzzles in high-energy physics.
On the one hand, the statistical hadronization model can describe the particle yields, including the yields of light nuclei, over a wide range of energies in AA collisions. The particle abundances are fixed at the chemical freeze-out, but since the binding energy of light nuclei is very small, at most a few MeV, it is not probable that they remain bound during the hadronic phase with temperatures between 100 MeV and 170 MeV.
On the other hand, the nuclei yields can be explained by the coalescence of protons and neutrons which are close by in phase space.
To address this topic, the ALICE collaboration has measured (anti-)nuclei up to A = 4 in Pb–Pb collisions as well as deuterons in pp and p–Pb collisions and 3He in pp collisions. This study is now extended by measuring the yield of (anti-)3He as a function of the transverse momentum in p–Pb collisions at √sNN=5.023 TeV. In addition, the anti-3He-over-3He ratio is calculated as a function of pT. With this ratio the CPT invariance can be tested by comparing it to unity because the baryo-chemical potential is zero at the LHC.