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HK: Fachverband Physik der Hadronen und Kerne

HK 11: Hadron Structure and Spectroscopy II

HK 11.2: Vortrag

Montag, 11. März 2024, 17:00–17:15, HBR 62: EG 19

Analysis of the reaction pp→ppKK with HADES — •Valentin Kladov^1,2, Johan Messchendorp², and James Ritman^1,2,3 — ¹Ruhr-Universität Bochum — ²GSI Helmholtzzentrum fur Schwerionenforschung GmbH — ³Forschungszentrum Jülich

In this study we present an exclusive analysis of the pp→ppKK reaction with data collected by the HADES detector during February 2022. In the course of this analysis, we developed a neural network-based particle identification procedure (PID), which compensates for the differences between simulation and experiment via domain adversarial technique, mixing experimental and simulation datasets during training. With this PID we detect and identify all final state particles, which allows an efficient suppression of background by means of kinematic refit with a 4C constraint, corresponding to the conservation of 4 Momentum in the process. We observed clear signals from φ(1020)→KK and Λ(1520)→pK with their parameters consistent with PDG data within one standard deviation. This talk will present the event selection procedures which will be the basis for a subsequent partial wave analysis, with the goal to determine the contribution of various baryonic resonances in the initial step of the reaction. Additionally, the analysis will be extended to the ppKKπ⁰ final state.

Keywords: HADES; exclusive analysis; kinematic refit; machine lerning