Köln 2025 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 56: Hadron Structure and Spectroscopy VII

HK 56.3: Talk

Thursday, March 13, 2025, 18:00–18:15, HS 3 Physik

Studying the strong nuclear force in the strangeness S=−1 sector via Λπ femtoscopy — •Daniel Battistini for the ALICE Germany collaboration — Technical University of Munich, Munich, Germany

Due to its non-perturbative nature at low energies, a deep understanding of the strong force still represents a challenge for the physics community. From the theoretical side, the study of low-energy QCD is typically conducted employing effective field theories (EFT) which are based on low-energy constraints to be anchored to the experimental measurements. Understanding the strangeness S=−1 meson-baryon systems is particularly relevant because they are characterised by a rich coupled-channel structure and feature the emergence of dynamically generated states. At present, EFT calculations have been well constrained by experimental data for energies above the K-N threshold. At lower energies, there are tensions among models due to the limited amount of measurements. The study of Λπ⁺ and Λπ⁻ interactions is so relevant because it allows accessing the K-N sub-threshold energies, leading to new experimental inputs to EFTs. In this contribution, the Λπ strong interaction is measured using the femtoscopy technique applied to high-multiplicity proton-proton collisions at √s = 13 TeV recorded by the ALICE collaboration. Funded by the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) under Germany’s Excellence Strategy – EXC-2094 – 390783311.

Keywords: femtoscopy; ALICE; Lambda; pion