Bonn 2020 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 33: Hadron Structure and Spectroscopy VII

HK 33.4: Talk

Wednesday, April 1, 2020, 17:30–17:45, J-HS A

Heavy-Light Tetraquarks in a Bethe-Salpeter Approach — •Nico Santowsky and Christian S. Fischer — JLU Gießen, Germany

We investigate heavy-light tetraquarks with quark content (ccqq)/(ccqq) with a fixed heavy quark mass m_c=charm and a variable light quark mass m_q using the Dyson-Schwinger/Bethe-Salpeter framework (DSE/BSE). We explicitly treat internal ‘cluster’ structures mesonic (cq−cq), hadro-charmonium (cc−qq) and diquarkonic (cq−cq), with meson and diquark states, determined by their DSE/BSEs. We investigate possible candidates for the states X(3872), Z(3900) and (ccūū)_0⁺/1⁺. For the X(3872) and the Z(3900) we find that these are essentially dominated by the mesonic DD^* component indicating the possibility of a molecular structure. The scalar (ccūū) shows two states, where the ground state seems to be dominated by the mesonic η_cπ component, whereas the excited one has diquarkonic contributions.