Köln 2025 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 49: Hadron Structure and Spectroscopy VI

HK 49.5: Vortrag

Donnerstag, 13. März 2025, 17:00–17:15, HS 3 Physik

Novel constraints for the multi-strange meson-baryon interaction using correlation measurements with ALICE — •Valentina Mantovani Sarti for the ALICE Germany collaboration — TUM Department of Physics, Garching, Germany

We present unprecedented correlation measurements involving Λ, Ξ, kaons and pions measured by ALICE in pp collisions at 13 TeV.

Several measurements are presented for the first time, constituting new experimental constraints on the strangeness S=-1,-2 meson-baryon interactions and the nature of exotic states.

The strong interactions involving mesons and baryons with strangeness content delivers a rather broad spectrum of interesting states, arising from the rich interplay between the elastic and inelastic QCD dynamics. The Λ(1405) in the S=-1 sector is an example of such molecular state, but in order to build a solid description of its inner structure more data are needed particularly below the antiKN energy threshold.

Much less experimental data are currently available on another potential molecular state, the Ξ(1620), predicted and observed in the S=-2 meson-baryon sector.

The correlation data we present here constitute new constraints on these sectors and delivers a better understanding on such states. Funded by the Deutsche Forschungsgemeinschaft (DFG) through the grant MA 8660/1 * 1.

Keywords: femtoscopy; strong interaction; molecular states