Studies of the X(3872) at Belle II

Sumitted to PubDB: 2022-01-11

Category: Proceeding, Visibility: Public

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Authors	Elisabetta Prencipe
Date	Jan. 10, 2022
Belle II Number	BELLE2-CONF-PROC-2022-001
Abstract	The X(3872) is one of the most puzzling resonances ever observed. First seen by the Belle Collaboration in 2003, it solicited the effort of a hundred of experimental physicists and dozens of theorists, who nowadays are trying yet to shed light on the nature of this peculiar resonant state. It was seen in several decay modes and different production mechanisms, and confirmed by several experiments, so it is well established, and recently is addressed as the $\chi_{c1} (3872)$. Here we report about a re-discovery of the X(3872) with early Belle II data, and discuss plans for future measurements once the full integrated planned luminosity will be achieved by Belle II.