Erlangen 2026 – scientific programme
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HK: Fachverband Physik der Hadronen und Kerne
HK 6: Heavy-Ion Collisions and QCD Phases I
HK 6.5: Talk
Monday, March 16, 2026, 17:30–17:45, PHIL C 601
Analysis strategy for a Ξc+ lifetime measurement with ALICE at the LHC — •Simon Pijahn for the ALICE Germany collaboration — Pysikalisches Institut, Universität Heidelberg
Experimentally measured charm-baryon lifetime ratios from LHC and Fermilab were long understood to be well described within the Heavy Quark Expansion (HQE) framework. However, in 2018 LHCb reported an Ωc0 lifetime almost four times larger than previous measurements, inverting the expected lifetime hierarchy. This result has since been supported by measurements from BELLE II and by more precise LHCb determinations of the Ωc0 and Ξc0 lifetimes. These persistent discrepancies highlight the need for additional, precise lifetime measurements for an accurate treatment of higher order terms in the HQE framework and to clarify the experimental situation. As the HQE is strong in predicting lifetime ratios, corresponding measurements of all charm baryons are of interest.
To complement ongoing measurements of charm-baryon lifetimes with the ALICE detector,
this contribution presents the analysis strategy and performance for a measurement of the Ξc+ baryon lifetime in pp collisions at √s = 13.6 TeV. The analysis employs the Kalman Filter Particle package for secondary vertex reconstruction, boosted decision trees for candidate selection, and a data-driven approach to disentangle prompt from non-prompt contributions.
Keywords: Heavy Flavor; Lifetime; ALICE