Erlangen 2026 – wissenschaftliches Programm

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T: Fachverband Teilchenphysik

T 34: Data, AI, Computing, Electronics IV

T 34.7: Vortrag

Dienstag, 17. März 2026, 17:45–18:00, KH 02.014

A Common Language for Complex Particle Decays: demonstrated on B⁺ → D^*± D^∓ K⁺ — •Alexander Kazatsky, Mikhail Mikhasenko, and Marian Stahl — Experimental Physics I, Ruhr-University Bochum, Germany

The Amplitude Model Serialization (AMS) project of the DEMOS (DEMocratizing MOdelS) consortium aims to provide a standardized format for the description of particle decay processes of varying complexity. This enables more straightforward reproduction of existing analyses, offers a framework for performing new amplitude studies, and facilitates the integration of complex decay chains into external systems such as Monte Carlo generators. In this work, the translation of a partial-wave analysis from the TensorFlow Partial Wave Analysis (TF-PWA) framework, which is widely used in experiments like LHCb and BESIII, is demonstrated. While the AMS format has so far been applied to singular three-body decays, the present analysis of B⁺ → D^*± D^∓ K⁺ features a more complex topology. Namely, the decay of D^*± → D⁰ π^± needs to be accounted for. The branching structure of two-body decays inherent to TF-PWA is translated into a system of three- and two-body decays in the AMS format. This coupled-channel analysis, which previously revealed new tetraquark candidates (PRL 133 (2024) 13, 131902), was reproduced using TF-PWA, translated, and repeated in the AMS framework. A standardized workflow for translating models from TF-PWA into the AMS system is presented.

Keywords: hadronic reactions; cascade decays; amplitude analysis; serialization; TensorFlow