Erlangen 2026 – scientific programme
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T: Fachverband Teilchenphysik
T 78: Flavour Physics V
T 78.3: Talk
Thursday, March 19, 2026, 16:45–17:00, KH 02.014
Reconstruction of multi-strange baryons Ξ and Ω in pp collisions at sqrt(s) = 13.6 TeV with the ALICE detector — Bilge Jin ONEN1 and •Ayben Karasu Uysal2 — 1Istanbul Technical University, Istanbul, Turkey — 2Yildiz Technical University, Istanbul, Turkey
Strangeness production has long been regarded as a key signature of the quark-gluon plasma (QGP), a deconfined state of matter created in ultra-relativistic heavy-ion collisions. Similar features such as collective flow and enhanced yields of strange and multi-strange baryons have also been observed in high-multiplicity small collision systems, including proton-proton (pp) interactions at the LHC. These findings make the study of strangeness a central topic within the ALICE experiment, where pp collisions provide a unique environment to investigate QGP-like effects without the presence of large-volume nuclear matter.
In this work, the reconstruction of the multi-strange baryons Ξ (dss) and Ω (sss) in pp collisions at sqrt(s) = 13.6 TeV is presented using standard topological selections and invariant-mass analysis techniques. The cascade weak decays Ξ- -> Λ π- and Ω- -> Λ K-, with Λ -> p π-, are reconstructed from charged decay tracks identified with the ITS, TPC and TOF detectors. The obtained corrected yields agree with published ALICE results within uncertainties, validating the classical reconstruction. This analysis provides a solid reference for future studies exploring machine-learning-based selection strategies.
Keywords: multi-strange baryons; proton–proton collisions; invariant mass reconstruction; strangeness production; ALICE