Erlangen 2026 – scientific programme
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HK: Fachverband Physik der Hadronen und Kerne
HK 38: Hadron Structure and Spectroscopy VIII
HK 38.3: Talk
Thursday, March 19, 2026, 17:00–17:15, PHIL A 401
Investigation of the reaction pp → ppK+K− at 4.5 GeV with HADES detector — •Valentin Kladov1,2, Johan Messchendorp2, and James Ritman1,2,3 for the HADES collaboration — 1Ruhr-Universität Bochum, Bochum, Germany — 2GSI Helmholtzzentrum für Schwerionenforschung GmbH, Darmstadt, Germany — 3Forschungszentrum Jülich GmbH, Jülich, Germany
This study presents an exclusive analysis of the pp → ppK+K− reaction using data collected with the HADES detector with a 4.5 GeV proton beam. The event selection is based on a neural-network particle identification employing a domain-adversarial approach. Together with a kinematic refit imposing four-momentum conservation, the purity of the final sample reaches S/B ≈ 30. Clear contributions from φ(1020)→K+K− and Λ(1520)→pK− are observed, with masses and widths consistent with the PDG data. S-wave final-state interactions are investigated by extracting the pK− and K+K− scattering-length parameters. This talk focuses on the particle identification performance studies, systematic uncertainties, and several new results, including improved angular analysis for the spin alignment of the φ(1020) resonance and a coupled-channel analysis of Λ(1405)→Σ0π0 / pK− decays.
Keywords: machine learning; strangeness production; proton proton collisions; HADES