Gießen 2024 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 57: Hadron Structure and Spectroscopy VII

HK 57.4: Talk

Wednesday, March 13, 2024, 18:30–18:45, HBR 62: EG 18

Study of p–p–π^± and p–π^± femtoscopic correlations with ALICE at the LHC — •Marcel Lesch for the ALICE Germany collaboration — TU Munich, Germany

Recent theoretical models propose that the QCD axion might have a crucial impact on the equation of state of dense nuclear matter, consequently affecting the study of neutron stars. While the QCD axion has not been directly observed yet, its properties at finite baryonic densities can be linked to the in-medium properties of pions. Constraining the latter is thus crucial for studying the QCD axion and its impact on the description of neutron stars. In this talk, we present recent results of femtoscopic correlations between pions and protons in high-multiplicity pp collisions at √s = 13 TeV measured by ALICE. These small systems produce particles at relative distances of about 1 fm. Therefore, the emission of multiple hadrons can be used to mimic a large-density environment. Firstly, results on p–π^± are discussed. These two-body correlations play an important role in understanding the lower-order contributions present in the three-body system. Using recently developed three-body femtoscopic techniques, we present the first measurements of p–p–π^± correlations. These results provide new insights on the in-medium properties of pions relevant to the study of the QCD axion.

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

Keywords: ALICE; Femtoscopy; Three-Body; Axion; Proton-Pion