关于$K^-$ D原子基态的宽度
On the width of the $K^-$D atom ground state
摘要：
在DA $Φ$ NE-Frascati和J-PARC的实验计划产生$K^-$ D原子，并观察它们的X射线级联到1 $S$基态（g.s.），从而测量其强相互作用宽度并从纯库仑态移开。宽度$Γ_{1S}\lesssim 1$ keV将确保馈送1 $S$ g. s的X射线跃迁的良好分辨率。在这里，我们研究了预期的$K^-$ D 1 $S$ g. s。宽度从全局的角度适合在整个周期表较重的K介子原子的能级位移和宽度，使用$K^-$核光学势从$\bar K N$手性相互作用模型构建。特别注意的是，在亚阈值能量的$\bar K N$子系统在$K^-$ D原子g. s相互作用。在这种方法中，我们预测了$K^-$ D原子1 $S$ g.s.的接近700 eV和约1.2至1.3 keV的宽度的强相互作用向上能级位移，与真正的三体$K^-$ D原子计算相当一致。与$π^-$ D原子唯象作了比较。
英文摘要：
Experiments at DA$Φ$NE-Frascati and at J-PARC are scheduled to produce $K^-$D atoms and observe their X-ray cascade down to the 1$S$ ground state (g.s.), thereby measuring its strong-interaction width and shift away from a purely Coulomb state. A width $Γ_{1S}\lesssim 1$ keV will ensure good resolution of the X-ray transitions feeding the 1$S$ g.s. Here we study the expected $K^-$D 1$S$ 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 $\bar K N$ chiral interaction models. Special attention is paid to the subthreshold energy at which the $\bar K N$ subsystem interacts in the $K^-$D atomic 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 1$S$ g.s., in fair agreement with genuinely three-body $K^-$D atom calculations. Comparison is made with $π^-$D atom phenomenology.
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