Köln 2025 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 15: Hadron Structure and Spectroscopy I
HK 15.3: Vortrag
Dienstag, 11. März 2025, 14:45–15:00, HS 3 Physik
First measurement and investigation of the ρ0–p final-state interaction with ALICE — •Maximilian Korwieser for the ALICE Germany collaboration — Technische Universität Muenchen
Experimental data on the interaction between vector mesons and nucleons are a crucial input for understanding the pattern of in-medium chiral symmetry restoration (CSR) and dynamically generated excited N states. However, accessing these interactions is hampered by the short-lived nature of the vector mesons, making traditional scattering experiments unfeasible. In recent years, the ALICE Collaboration employed femtoscopy to measure similar challenging systems like the p–Ω and φ–p. By leveraging the excellent PID capabilities of the ALICE experiment, coupled with the copious production of ρ0p pairs at the LHC in small colliding systems, ALICE presents the first-ever measurement of the momentum correlation function between ρ0 and p. The data are interpreted employing calculations within the framework of unitarised chiral perturbation theory in a coupled-channel approach. This measurement represents an unprecedented opportunity to study the nature of the excited N in particular N(1700) and N(1900), possibly unveiling if these states are molecular in nature as well as shedding light on possible signatures of CSR at LHC energies. This work was supported by ORIGINS cluster DFG under Germany’s Excellence Strategy-EXC2094 - 390783311 and the DFG through the Grant SFB 1258 *Neutrinos and Dark Matter in Astro and Particle Physics*.
Keywords: Femtoscopy; Final-state-interaction studies; ALICE; Two-Particle correlation