SMuK 2021 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 19: Hadron Structure and Spectroscopy IV

HK 19.7: Talk

Wednesday, September 1, 2021, 18:15–18:30, H3

New experimental limits on the effective hadron interaction with strangeness = -3 by ALICE — •Georgios Mantzaridis for the ALICE collaboration — Technische Universität München

Accessing experimentally the hadron-hadron interactions for systems of various quark content is essential to validate theoretical calculations, first principles and effective models alike. In the case of nucleon-nucleon (NN) interactions scattering experiments provide good constrains for the theory. However, the nucleon-hyperon (NY) interaction is difficult to access with traditional experimental techniques, and mostly limited to the strangess -1 sector.

Recent results from the ALICE collaboration demonstrated the feasibility of using two-particle correlation techniques to investigate the interaction between pairs containing multi-strangeness. We present measurements in the strangeness -3 sector using the p-Ω⁻ and the Λ-Ξ⁻ channels, both studied in high-multiplicity pp collisions at √s = 13 TeV with ALICE at the LHC.

We have compared the p-Ω⁻ interaction to first principle lattice QCD calculations and found that they agree with the measured data if the inelastic channels are neglected. In particular the p-Ω⁻ system couples to Λ-Ξ⁻ and the strength of this coupling depends on the strength of the interaction itself. Thus, we have measured the Λ-Ξ⁻ correlation and compared the results to chiral effective field theory calculations. A shallow Λ-Ξ⁻ interaction is supported, which is compatible with a weak contribution to the p-Ω⁻ correlation.