Gießen 2024 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 71: Hadron Structure and Spectroscopy X

HK 71.6: Talk

Thursday, March 14, 2024, 17:00–17:15, HBR 62: EG 19

Studying the interaction between charm and light-flavor mesons — •Daniel Battistini for the ALICE Germany collaboration — Technical University of Munich, Munich, Germany

In the last years, several exotic states have been observed in the charm sector. Such particles cannot be interpreted as regular baryons or mesons and are thought to be either quark bags or molecular states. To unveil their nature, it is crucial to experimentally constrain the strong force that governs the interaction between the charm hadrons and other hadrons. The knowledge of the strong interaction in the charm sector is also essential for the study of ultrarelativistic heavy–ion collisions. In fact, during the hadronic phase of the system expansion, the charm hadrons interact with the hadron gas produced in the collisions. Such interactions modify the heavy-ion observables, and, to disentangle this effect from the signatures of the quark-gluon plasma formation, the scattering parameters of the charm hadrons with light-flavor hadrons are required. The available experimental knowledge on the charm-hadron interactions is, however, very poor. In this contribution, the first measurement of the strong final-state interaction between open-charm and light-flavor meson systems is presented. The measurement is performed using the femtoscopy technique and high-multiplicity proton-proton collisions at √s = 13 TeV collected by the ALICE Collaboration. Funded by BMBF Verbundforschung (05P21WOCA1 ALICE).

Keywords: ALICE; charm; scattering parameters; strong interaction; femtoscopy