First measurement of the masses of the ${{\rm Y}}_1(1D)$ and ${{\rm Y}}_3(1D)$ states and the energy dependence of the cross sections for $e^{+}{e}^{-}\to {{\rm Y}}_J(1D)\eta$ and $e^{+}{e}^{-}\to {{\rm Y}}_J(1D){\pi }^{+}{\pi }^{-}$

Belle, Belle II Collaborations, : +398

We study the processes $e^{+}{e}^{-}\to {{\rm Y}}_J(1D)\eta$ and $e^{+}{e}^{-}\to {{\rm Y}}_J(1D){\pi }^{+}{\pi }^{-}$ at center-of-mass energies $\sqrt{s}$=(10.73 -- 11.02) GeV using a $142.5{\mathrm{fb}}^{-1}$ data sample, in…