Recent Hadron Spectroscopy Results from the Belle and Belle II experiments

Abstract

The Belle~II experiment, the major upgrade of the Belle detector, is currently collecting data at the SuperKEKB asymmetric-energy $e^{+}{e}^{-}$ collider in Tsukuba, Japan. With an integrated luminosity of 575\,fb${}^{-1}$, Belle~II has already surpassed the maximum luminosity accumulated by both BaBar and Belle. Recent analyses combining Belle and Belle~II data sets have delivered results of unprecedented precision, demonstrating the strong potential of the unified data sample, which now exceeds 1.5\,ab${}^{-1}$. In this contribution, recent advances in hadron spectroscopy are presented. Highlights include new results in bottomonium and charmonium physics, with particular emphasis on the structure of the ${\rm Y}(10753)$, searches for hidden-charm and hidden-strangeness pentaquarks, and the latest developments in baryon spectroscopy, including studies of the $\Omega (2012)$ and excited ${\Lambda }_c$ states. Prospects for future spectroscopy analyses exploiting the full Belle and Belle~II data sets are also discussed.

8 pages, 4 figures, Proceedings of the 53rd International Symposium on Multiparticle Dynamics (ISMD 2025) submitted and accepted as PoS (CORFU2025) 420 - Proceedings of Science