SMuK 2023 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 58: Hadron Structure and Spectroscopy VII

HK 58.1: Gruppenbericht

Donnerstag, 23. März 2023, 14:00–14:30, SCH/A419

Understanding the dynamics of three-body systems using femtoscopy at the LHC — •Raffaele Del Grande for the ALICE Germany collaboration — Technical University of Munich, Garching, Germany

Three-body forces among hadrons are necessary for the theoretical description of nuclear bound objects and for modeling the equation of state of neutron stars. Direct measurements of three-body interactions are currently missing and represent one of the current challenges for experimental nuclear physics. The ALICE Collaboration has recently extended the femtoscopy technique to explore the strong interaction in three-particle systems, exploiting both three-hadron and hadron-nucleus correlation studies. The present contribution provides an overview of the milestones reached by ALICE in the study of three-body systems, using the femtoscopy technique in pp collisions at √s = 13 TeV. The main highlights are the first experimental measurements of three-baryon correlations, p–p–p and p–p–Λ, and the first study of three-body systems with kaons, p–p–K⁺ and p–p–K⁻. The contribution of genuine three-body effects in the measured correlation functions has been isolated using Kubo’s cumulant expansion method. The interpretation of such measurement and the possible implications on the equation of state of neutron stars and bound state formation will be discussed.

This research was funded by DFG SFB1258 and BMBF Verbundforschung (05P21WOCA1 ALICE).