SMuK 2023 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 58: Hadron Structure and Spectroscopy VII

HK 58.3: Vortrag

Donnerstag, 23. März 2023, 14:45–15:00, SCH/A419

Investigating p–π⁺ and p–π⁻ femtoscopic correlations with ALICE at the LHC — •Marcel Lesch for the ALICE Germany collaboration — TUM, James-Franck-Straße 1, 85748 Garching bei München

The modelling of neutron stars is deeply linked to the understanding of the nuclear equation of state (EoS). It was recently proposed that the QCD axion might impact the EoS of neutron stars and that its properties at large baryonic densities can be related to the in-medium properties of pions. Constraining the latter is thus crucial for the study of the QCD axion and its impact on the description of neutron stars. By employing recently developed three-body femtoscopic techniques, the in-medium properties of pions can be inferred from correlation measurements between pions and many nucleons in pp collisions at the LHC. These small systems produce particles at distances of ∼ 1 fm, mimicking a large-density environment. However, to understand the experimental three-body correlations, the lower-order two-body correlations between p–π⁺ and p–π⁻ must be constrained. In this talk, we present the first measurement of p–π⁺ and p–π⁻ correlations using two-body femtoscopy. The results have been obtained by analysing high-multiplicity pp collisions at √s = 13 TeV measured by ALICE.

This research was funded by the DFG under Germany’s Excellence Strategy - EXC2094 - 390783311 and the BMBF Verbundforschung (05P21WOCA1 ALICE).