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HK: Fachverband Physik der Hadronen und Kerne
HK 44: Heavy-Ion Collisions and QCD Phases IX
HK 44.6: Talk
Wednesday, March 13, 2024, 17:00–17:15, HBR 62: EG 03
Strangeness tracking with the upgraded ALICE Inner Tracking System in Run 3 at the LHC — •Carolina Reetz for the ALICE Germany collaboration — Physikalisches Institut Heidelberg
A precise reconstruction of particles containing strangeness in high energy proton-proton and heavy-ion collisions is crucial not only for measurements of (multi-)charm baryons via their decays into strange baryons but also for measurements of strange hypernuclei such as the hypertriton Λ3H.
A novel technique called strangeness tracking is introduced making use of the upgraded silicon tracker (ITS2) of the ALICE detector in LHC Run 3. The new reconstruction approach allows to directly track weakly decaying charged strange hadrons and hypernuclei in the silicon layers closest to the beam pipe before they decay. The combination of the daughter track information with the measured hits of the parent particle trajectory in the ITS2 layers leads to significant improvements in the reconstruction performance and specifically the impact parameter resolution.
The strangeness tracking performance for ALICE Run 3 proton-proton collisions and simulations is presented with an emphasis on the reconstruction of charged Ξ-baryons.
Keywords: ALICE; strangeness reconstruction; heavy flavour