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HK: Fachverband Physik der Hadronen und Kerne

HK 57: Hadron Structure and Spectroscopy VII

HK 57.3: Vortrag

Mittwoch, 13. März 2024, 18:15–18:30, HBR 62: EG 18

The first study of the Λπ strong interactions with ALICE — •Marcello Di Costanzo for the ALICE Germany collaboration — Technical University, 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 S = −1 meson-baryon systems is extremely 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 Λ π⁺ and Λ π⁻ 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 measurement of the Λ π scattering parameters is carried out by exploiting correlation function analysis and using ALICE data consisting of high-multiplicity proton-proton collisions at √s = 13TeV.

Keywords: Femtoscopy; ALICE; Strangeness; Strong interaction; Lambda