Mainz 2022 – scientific programme
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HK: Fachverband Physik der Hadronen und Kerne
HK 20: Hadron Structure and Spectroscopy IV
HK 20.5: Talk
Monday, March 28, 2022, 17:00–17:15, HK-H9
New experimental limits on the effective strong interaction between multi-strange hadrons by ALICE — •Georgios Mantzaridis1 and Otón Vazquez Doce2 for the ALICE collaboration — 1Technische Universität München, Fakultät für Physik, James-Franck-Str. 1, 85748 Garching — 2Laboratori Nazionali di Frascati, Via Enrico Fermi 40, 00044 Frascati (Roma)
Understanding from first principles the strong interaction between hadrons with S<−1 is one of the key challenges for nuclear physics today. Traditional experimental techniques such as scattering or hypernuclei experiments are not able to access these strangeness sectors because of the small lifetimes of the involved hadrons. On the other hand calculations using lattice QCD are particularly stable in this regime because of the larger quark masses.
In an attempt to close this gap we present the direct measurement of two interactions of the S = −3 sector: the p-Ω− and the Λ-Ξ− interaction. For both systems the correlation function was measured 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. The Λ-Ξ− correlation function is compared to predictions from leading order chiral effective field theory, meson exchange models as well as lattice QCD calculations. The data supports a shallow Λ-Ξ− interaction which is more compatible with small scattering parameters.