Heavy Quarkonia and Multiquarks at B-factories

Sumitted to PubDB: 2023-10-02

Category: Proceeding, Visibility: Public

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Authors	Roberto Mussa
Date	2023-09-30
Belle II Number	BELLE2-CONF-PROC-2023-037
Abstract	This review will cover the most recent results from the B factories in the field of heavy quarkonia and multiquark systems. At Belle-II, the first data taking period beyond the $Υ (4 S)$ peak energy has been been devoted to the study of the region around $\sqrt{s} = 10.75$ GeV, where enhanced transition rates to lower bottomonia suggested the existance of a new exotic bound state. In turn, LHCb keeps discovering new tetraquarks and pentaquarks at steady pace. Most of them are composed by at least one $c \bar{c}$ pair, but recently also systems with two $\ccbar$ pairs and tetraquarks with open double charm have been found.