Seongbae Yang

10 October 2023
MENU2023

Abstract: Belle II, which commenced data acquisition in 2019, has already yielded research results in hadron spectroscopy. The $e^{+}e^{-}$ collision data, taken at or near the $\Upsilon(4S)$ resonance, are well-suited for studying hadrons with a high-performance detector system. In this presentation, we will show the latest research outcomes in hadron spectroscopy, including searches for the hidden bottom transitions between $\Upsilon(10753)$ and bottomonia, measurements of the energy dependence of the $e^{+}e^{-} \rightarrow B^{(*)}\bar{B}^{(*)}$ cross-section, and lifetime measurements of charmed hadrons. The talk also covers recent results from the Belle experiment, which ended operation in 2010. Notably, we will reveal a threshold cusp observed at the $\Lambda\eta$ threshold in the $pK^{-}$ system and new $\Lambda\pi$ signals observed near the $\bar{K}N$ mass threshold in the $\Lambda_{c}^{+}$ decays.