Abstract
The ALICE experiment at the LHC has measured a variety of (anti-)(hyper-)nuclei produced in Pb–Pb collisions at [see formula in PDF] = 5.02 TeV and at 2.76 TeV. In addition, a large sample of high quality data was collected in pp collisions at √s = 7 TeV and 13 TeV and in p-Pb collisions at [see formula in PDF] = 5.02 TeV. These data are used to study the production of different (anti-)(hyper-)nuclei in the collisions, namely (anti-)deuteron, (anti-)3He, (anti-)alpha and (anti-)3ΛH. The identification of these (anti-)(hyper-)nuclei is based on the energy loss measurement in the Time Projection Chamber and the velocity measurement in the Time-Of-Flight detector. In addition, the Inner Tracking System is used to distinguish secondary vertices originating from weak decays from the primary vertex. New results on deuteron production as a function of multiplicity in pp, p–Pb and Pb–Pb collisions will be presented, as well as the measurement of 3He in p–Pb and Pb– Pb collisions. Special emphasis will be given to the new results of the (anti-)3ΛH in its charged-two-body decay mode. The large variety of measurements at different energies and system sizes constrains the production models of light flavour baryon clusters, in particular those based on coalescence and the statistical hadronisation approaches.
Highlights
The nuclei, anti-nuclei and hyper-nuclei formation mechanism in high energy collisions is still unknown
This observation is compatible with expectations from the statistical hadronisation [11] and the hadron coalescence models [12]
In both approaches the abundances of anuclide X with mass number A are coupled to those ofprotons according to the following relation: X/X ≈ (p/p)A
Summary
The nuclei, anti-nuclei and hyper-nuclei formation mechanism in high energy collisions is still unknown. Thanks to the LHC which provides pp, p–Pb and Pb–Pb collisions at the highest energy ever reached in the laboratory, the ALICE experiment is able to shed light on the phenomenology of ((aannttii--))(3hHyepeinr-)pnpuccloelilipsiroondsucattio√n.s. The latest = 13 TeV results on the production√spectra and Pb–Pb collisions at sNN =. Of (anti-)deuteron 5.02 TeV will be and discussed here. The results are compared with the expectation from the statistical hadronisation and the hadron coalescence models. The new measurement of the (anti-)3ΛH lifetime by the ALICE experiment, which is the most precise ever performed, will be discussed
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