Mainz 2022 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 9: Hadron Structure and Spectroscopy I

HK 9.4: Vortrag

Montag, 28. März 2022, 15:00–15:15, HK-H8

Accessing three-body strong interactions of p–p–π⁺ and p–p–π⁻ with ALICE at the LHC — •Marcel Lesch for the ALICE collaboration — TUM

In the quest of understanding the nuclear equation of state, which is linked to the modelling of neutron stars, the QCD axion might play a crucial role. The properties of axions are expected to change in systems at finite baryonic densities and in particular they can be related to the in-medium properties of pions. Constraining these properties is thus crucial for the study of the QCD axion and its impact on the description of neutron stars.

The in-medium pion properties can be accessed by the measurement of interactions between pions and many nucleons produced in pp and p-Pb collisions at the LHC. These small systems produce particles at distances of ∼ 1 fm, mimicking a large density environment. This talk will present the first experimental three-body correlations of the p–p–π⁺ and p–p–π⁻ triplets by using the three-body femtoscopy technique. The results have been obtained by analysing high-multiplicity pp collisions at √s = 13 TeV measured by ALICE. The three-body effects are probed by employing the Kubo cumulant formalism to subtract the lower order contributions from the measured triplet correlation functions.