Erlangen 2026 – scientific programme
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T: Fachverband Teilchenphysik
T 51: Flavour Physics III
T 51.3: Talk
Wednesday, March 18, 2026, 16:45–17:00, KH 01.011
Pole Search for Ξ*(1620) and Ξ*(1690) Resonances in the Ξc+→Ξ−π+π+ Decay at LHCb — •Anna Lena Zimmer, Mikhail Mikhasenko, and Marian Stahl — Ruhr-Universität Bochum, Germany
Understanding the excitation spectrum of strange baryon resonances remains a challenge. In particular, many excited Ξ baryon states are poorly established and their properties vary widely between models. Pole positions characterize hadronic states in a reaction-independent manner, but are rarely determined with rigor. This project aims to extract the pole positions of Ξ*(1620)0 and Ξ*(1690)0 using parameters from an amplitude model of the decay Ξc+→Ξ−π+π+. The model is based on an analysis of the proton*proton collision data obtained by the LHCb detector at √s=13 TeV. The resonance poles are determined directly from the parameterized K-matrix model, coupling the Ξπ, ΛK, ΣK and Ξη scattering channels. The extracted pole parameters aid in accurate reaction-independent quantification of the excitation spectrum and evaluation of coupled channel effects.
Keywords: hadronic decay; LHCb; charmed baryon; resonances