Köln 2025 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 34: Hadron Structure and Spectroscopy IV
HK 34.4: Vortrag
Mittwoch, 12. März 2025, 18:15–18:30, HS 3 Physik
Investigation of the exclusive pp → ppKK reaction using data collected by HADES — •Valentin Kladov1,2, Johan Messchendorp2, and James Ritman1,2,3 for the HADES collaboration — 1Ruhr-Universität Bochum — 2GSI Helmholtzzentrum — 3Forschungszentrum Jülich
This study presents the exclusive analysis of the pp→ ppK+K− reaction with data taken with the HADES detector in February 2022 at a center-of-mass energy of 3.5 GeV. A neural network-based particle identification was developed, which compensates for simulation-experiment discrepancies via domain adversarial technique. The background was suppressed by the means of kinematic refit with a 4C constraint, corresponding to the conservation of 4-momentum, which allowed us to obtain a high-purity sample of data with S/B≈15. Clear signals from φ(1020) → K+K− and Λ(1520) → pK− decays were observed with their parameters consistent with those published by the PDG. Moreover the importance of K+K− non-resonant final state interactions was confirmed. This talk will discuss the details of our event selection, efficiency corrections and present a number of intermediate results, including total cross section and φ/K ratio measurements.
Keywords: proton-proton; HADES; phi(1020); kinematic fit; neural network