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The Belle II experiment at the SuperKEKB energy-asymmetric e^+e^- collider is the upgraded successor of the B-factory facility at the KEK laboratory, Japan. The first data taking period beyond the (4S) peak energy has been devoted to the study of the region around s = 10. 75 GeV, where enhanced transition rates to lower bottomonia suggested the existence of a new exotic bound state. This proceedings summarizes the most recent measurements of exotic quarkonium states to probe the fundamentals of QCD at the Belle II experiment.
Renu Garg (Mon,) studied this question.