Subthreshold poles in electron-positron annihilation. ${\rm D}_s^+{\rm D}_s^-$ final state
Peter Lichard, Josef Juráň
公開日: 2025/7/7
Abstract
We present the evidence of a subthreshold pole in the $e^+ e^-\rightarrow {\rm D}_s^+{\rm D}_s^-$ process, which can be interpreted as an excited (2p) state of the ${\rm D}_s^+{\rm D}_s^-$ molecule with a binding energy of (42$^{20}_{-13}$)~MeV.