Experiments at DAΦNE-Frascati and at J-PARC are scheduled to produce $K^{-}$D atoms and observe their X-ray cascade down to the 1S ground state (g.s.), thereby measuring its strong-interaction width and shift away from a purely Coulomb state. A width ${\mathrm{\Gamma }}_{1S}\lesssim 1$ keV will ensure good resolution of the X-ray transitions feeding the 1S g.s. Here we study the expected $K^{-}$D 1S g.s. width from the perspective of global fits to level shifts and widths in heavier kaonic atoms across the periodic table, using $K^{-}$ nuclear optical potentials constructed from $\overline{K}N$ chiral interaction models. Special attention is paid to the subthreshold energy at which the $\overline{K}N$ subsystem interacts in the $K^{-}$D atom g.s. Within this approach we predict strong-interaction upward level shift of close to 700 eV and width of about 1.2 to 1.3 keV for the $K^{-}$D atom 1S g.s., in fair agreement with genuinely three-body $K^{-}$D atom calculations. Comparison is made with ${\pi }^{-}$D atom phenomenology.

计划在DAΦNE-Frascati和J-PARC进行实验 ${ķ}^{-}$D原子观察X射线级联下降到1 S基态（gs），从而测量其强相互作用宽度并从纯粹的库仑态移开。宽度${\mathrm{\Gamma }}_{\mathrm{1个}\mathrm{小号}}\lesssim \mathrm{1个}$keV将确保馈入1 S gs的X射线跃迁的良好分辨率。${ķ}^{-}$从全局拟合的角度来看，D 1 S gs宽度与整个元素周期表中较重的钾原子的能级位移和宽度相符，使用${ķ}^{-}$ 核光势由 $\overline{ķ}ñ$手性相互作用模型。要特别注意低于阈值的能量，$\overline{ķ}ñ$ 子系统在 ${ķ}^{-}$D原子gs在这种方法中，我们预测强相互作用向上的水平移动接近700 eV，宽度约为1.2到1.3 keV。 ${ķ}^{-}$D原子1 S gs，与真正的三体结构完全相同${ķ}^{-}$D原子计算。与进行比较${\pi }^{-}$D原子现象学。