Erlangen 2026 – wissenschaftliches Programm
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T: Fachverband Teilchenphysik
T 51: Flavour Physics III
T 51.6: Vortrag
Mittwoch, 18. März 2026, 17:30–17:45, KH 01.011
Implementation of a generic three-body decay model in EvtGen for a Ξc+ polarimetry analysis — •Henry van der Smagt, Ilya Segal, Mikhail Mikhasenko, and Marian Stahl — Ruhr-University Bochum, Bochum, Germany
The amplitude-serialization project of the LHCb Bochum group as part of the BMFTR-funded Democratizing-Models (DEMOS) consortium provides a generic and well-structured format that facilitates reproducibility and exchange within the high-energy physics community. This work presents a C++ implementation of the helicity formalism using the Dalitz-plot decomposition method. The framework is integrated into a new decay model EvtThreeBodyDecays for EvtGen, the main b-physics event generator, which constructs amplitude models from JSON descriptions. The model enables the inclusion of the recently published Ξc+ → p K− π+ decay variables in hadronic amplitude analyses involving the Ξc+ baryon. Furthermore, it provides access to the polarimetry vector field of this decay, allowing studies of Ξc+ polarization and improved handling of model-dependent uncertainties by describing all 31 alternative models.
Keywords: Polarimetry; Pythia; EvtGen