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Gießen 2024 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 57: Hadron Structure and Spectroscopy VII

HK 57.3: Talk

Wednesday, March 13, 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 KN 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 KN 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

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