Mainz 2022 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 63: Hadron Structure and Spectroscopy XI

HK 63.4: Talk

Thursday, March 31, 2022, 15:00–15:15, HK-H8

Investigating the ΛK interaction using the femtoscopic technique with ALICE at LHC — •Rossana Facen for the ALICE collaboration — Technische Universität München, München, Germany

Traditionally, the strong interaction among hadrons has been studied through scattering experiments. However, this experimental technique becomes very challenging when unstable particles are taken into account. For this reason, a new experimental method, femtoscopy, has been developed to achieve further understanding in the field of Quantum Chromodynamics (QCD): femtoscopy represents a valid method to investigate the interactions between strong interacting particles.

Recent femtoscopic measurements performed by the ALICE collaboration in Pb-Pb collisions were able to provide the scattering parameters of the interaction between Λ hadrons and charged K mesons, predicting an attractive force between Λ and antikaons and a repulsive potential between Λ and kaons.

In this talk we will present the results on the measured correlation functions of ΛK⁺ ⊕ ΛK⁻ and ΛK⁻ ⊕ ΛK⁺ pairs obtained in high-multiplicity pp collision at √s = 13 TeV, recorded by the ALICE Collaboration. The small emitting source size achieved in such collisions, of the order of 1 fm, provides direct access to the underlying strong interaction between these hadrons. The scattering parameters extracted from the experimental data will be discussed in detail, compared to the findings obtained in Pb-Pb collisions as well as to the available theoretical chiral models.