Köln 2025 – scientific programme
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HK: Fachverband Physik der Hadronen und Kerne
HK 41: Hadron Structure and Spectroscopy V
HK 41.5: Talk
Thursday, March 13, 2025, 15:00–15:15, HS 3 Physik
Performance test of the KF Particle package for heavy-flavor hadron lifetime measurements with the ALICE detector — •Oleksii Lubynets for the ALICE Germany collaboration — Physikalisches Institut Universität Heidelberg
The lifetimes of heavy-flavor (HF) hadrons can be described using the heavy-quark expansion (HQE) method, which expresses the decay width as a series of (1/mQ)n, where mQ is the mass of the HF quark.
The predicted lifetimes can vary significantly depending on how higher-order terms in the expansion are handled.
This makes lifetime measurements a valuable tool for refining and validating the most accurate approaches within the HQE framework.
Recent measurements of the Ωc0 baryon lifetime by the LHCb and Belle II show significant deviations from previous results obtained at CERN and Fermilab.
These discrepancies highlight the need for new precise measurements.
The HF hadrons decay within the ALICE detector volume and are reconstructed through their decay topology using methods of the Kalman Filter algorithm.
To improve the resolution of decay parameters and increase the statistical significance of the measurements, a set of constraints is applied.
These constraints take into account the production vertex of the HF hadron (topological constraint) and the expected mass of the decaying particles (mass constraint).
In this work, the KF Particle package was employed to reconstruct the Λc → pKπ decay in pp collisions at √s = 13.6 TeV.
The performance of the KF Particle package in measuring the Λc lifetime and the effect of the applied constraints are discussed.
Keywords: Heavy-flavor physics; ALICE; baryon lifetime; complex decay topology reconstruction