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HK: Fachverband Physik der Hadronen und Kerne

HK 69: Heavy-Ion Collisions and QCD Phases XVI

HK 69.2: Talk

Thursday, March 14, 2024, 16:00–16:15, HBR 62: EG 05

Ξ-baryon reconstruction with ALICE in LHC Run 3 data — •Tim Weinreich for the ALICE Germany collaboration — Physikalisches Institut, Universität Heidelberg

The precise reconstruction of strange baryons like the Ξ is crucial to study charm baryons via their decay to strange baryons.
In order to extract a signal even in high charged particle multiplicity environments and low transverse momentum regions with high combinatorial background a precise reconstruction of the decay topology is invaluable for obtaining high invariant mass resolutions and reducing background for longer decay chains.
The Kalman Filter Particle (KFParticle) package is a complete reconstruction algorithm for complex decay topologies, fully taking into account the uncertainties of the daughter tracks.
In this work, the KFParticle package is used to reconstruct the cascade-like decay structure of the Ξ-baryon in simulated Run 3 proton-proton data at a centre of mass energy of √s = 13.6 TeV.
The reconstruction performance is compared to a reconstruction algorithm used for ALICE Run 3 data analysis, which is based on the minimisation of the distance of closest approach between daughter tracks. A comparison of the two reconstruction methods regarding secondary vertex, transverse momentum and invariant mass resolutions is presented.

Keywords: ALICE; KFParticle