SMuK 2021 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 24: Hadron Structure and Spectroscopy V

HK 24.7: Talk

Thursday, September 2, 2021, 18:15–18:30, H3

The Study of Genuine Three-Body Interactions in pp collisions with ALICE — •Laura Serksnyte for the ALICE collaboration — Technische Universität München

The femtoscopic studies done by the ALICE Collaboration provided results with unprecedented precision for the short-range strong interactions between different hadron pairs. The next challenge is the development of the three-particle femtoscopy which will deliver the first ever direct measurement of genuine three-body forces. Such results would be a crucial input for the low-energy QCD and neutron star studies. In particular, the momentum correlation of p–p–p triplets can provide information about genuine three-nucleon forces while the p–p–Λ interaction is a necessary piece to understand if the production of Λ hyperons occurs in neutron stars.
In this talk, the first study of p–p–p and p–p–Λ correlations will be presented. The results were obtained using high-multiplicity pp collisions at √s = 13 TeV measured by ALICE at the LHC. The measured three-body correlation functions include both three- and two-particle interactions. The cumulant method was applied to subtract lower-order contributions and infer directly on the genuine three-body forces. The two-particle contributions were estimated both experimentally by applying mixed-event technique, and mathematically by projecting known two-body correlation functions on the three-body systems. The measured p–p–p and p–p–Λ correlation functions and the corresponding cumulants will be shown.