Gießen 2024 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 72: Poster

HK 72.39: Poster

Thursday, March 14, 2024, 17:15–18:45, HBR 14: Foyer

Methods for three-particle correlation function analyses: from cumulants to full-fledged three-body calculations — •Raffaele Del Grande for the ALICE Germany collaboration — Technical University of Munich, Garching, Germany

In recent years the femtoscopy technique has been used by the ALICE Collaboration at the Large Hadron Collider (LHC) to perform new studies of the hadronic interactions. In pp and p–Pb collisions at the LHC particles are emitted at relative distances of about 1 fm and the final state interactions of the produced hadrons can be explored by measuring their correlation in the momentum space. The high statistics collected by ALICE during the LHC Run 2 data campaign allowed measuring for the first time the free scattering of three unbound hadrons, such as p–p–p, p–p–Λ, p–p–K⁺ and p–p–K⁻, providing new experimental information on the hadron dynamics in these three-body systems. The sensitivity to genuine three-body effects in the measured correlation functions has been studied using the cumulant analysis. This approach was used to show that in p–p–K⁺ and p–p–K⁻ systems only pairwise interactions are present in the systems without strong evidence of genuine three-body effects. In the case of three-baryons, such as p–p–p and p–p–Λ, full-fledged three-body calculations are necessary to interpret the measurements. In this contribution, an overview of the results obtained by ALICE from the analysis of the LHC Run 2 data acquired in pp collisions at 13 TeV will be presented. Future plans will be also discussed. This research was funded by DFG SFB1258 and BMBF Verbundforschung (05P21WOCA1 ALICE).

Keywords: femtoscopy; strong interaction