München 2019 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 47: Hadron Structure and Spectroscopy VII

HK 47.6: Vortrag

Donnerstag, 21. März 2019, 15:30–15:45, HS 13

Studying the ΛΛ interaction and the existence of a H-dibaryon using femtoscopy — •Dimitar Mihaylov for the ALICE collaboration — Technische Universität München, James- Franck-Straße, 85748, Garching, Germany

The femtoscopy method can be used to investigate both the emission source and the interaction potential between particle pairs by measuring their correlation function. The small emission source in pp and p–Pb collision systems at TeV energies results in an enhanced sensitivity to the strong interaction potential. Thus femtoscopy studies performed at the LHC can provide deep insights into the interaction between different baryon pairs.

In this study the ALICE collaboration performed a combined analysis of three different data sets, namely pp at √s=7,13 TeV and p–Pb √sNN=5.02 TeV, to investigate the Λ–Λ interaction potential. The emission source is obtained by using the p–p correlation as a reference, while the Λ–Λ interaction is studied within the effective range expansion, obtaining an exclusion plot for the scattering length and the effective range of the potential. The results allow to test the compatibility of different theoretical models to the ALICE data, as well as obtain tighter constraints on the allowed binding energy of the H-dibaryon, a hypothetical Λ–Λ bound state.

This work is supported by SFB1258.

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