Mainz 2022 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 43: Hadron Structure and Spectroscopy VIII

HK 43.5: Vortrag

Mittwoch, 30. März 2022, 15:15–15:30, HK-H9

New experimental frontiers in the study of many-hadron systems with ALICE at the LHC — •Raffaele Del Grande for the ALICE collaboration — TUM, Munich, Germany

The femtoscopy technique has recently been extended by the ALICE Collaboration to study the strong interaction among hadrons in three-particle systems. Three-body forces involving both nucleons and hyperons are necessary in the theoretical description of nuclear bound objects and represent an important ingredient in the calculation of the nuclear equation of state of neutron stars. Solid experimental constraints to the interaction models are currently missing and therefore, direct measurements of three-hadron interactions are strongly demanded.

The results presented in this talk are obtained using high-multiplicity pp collisions at √s = 13 TeV measured by ALICE at the LHC. The first measurement of p–p–p and p–p–Λ correlations will be shown. The corresponding genuine three-particle correlations are obtained by subtracting the known two-body effects from the measured correlation functions of the triplets. A non-zero three-particle cumulant is observed providing an insight on the three-body dynamics for p–p–p and p–p–Λ. The same approach has been used in the measurement of p–p–K⁺ and p–p–K⁻ correlations. The study of these systems is relevant, in particular, for the search of exotic bound states of antikaons and nucleons, whose possible formation is driven by the attractive nature of the isospin I=0 KN interaction below the mass threshold.