论文标题
在$ k^-$ d原子基态的宽度上
On the width of the $K^-$D atom ground state
论文作者
论文摘要
Da $φ$ ne-frascati和J-Parc的实验计划生产$ k^-$ d原子，并将其X射线级联反向至1 $ s $地面状态（G.S.），从而测量其强度相互作用的宽度并从纯粹的库隆状态转移。宽度$γ_{1S} \ Lessim 1 $ kev将确保良好的分辨率分辨出X射线过渡，以供应1 $ S $ G.S.在这里，我们研究了预期的$ k^-$ d 1 $ s $ g.s。从全球拟合的角度来看，使用$ k^ - $ k^ - $核光学电势从$ \ bar k n $手性交互模型构建的$ k^ - $核光学电位，从全球拟合的角度到水平变化和宽度。特别注意$ \ bar k n $子系统在$ k^-$ d atomic G.S.中的跨阈值能量。在这种方法中，我们预测，对于$ k^ - $ d atom 1 $ s $ g.s.的强度相互作用的向上转移接近700 eV，宽度约为1.2至1.3 keV，与真正的三体$ k^ - $ d atom计算公平地达成协议。比较是用$π^ - $ d原子现象学进行的。
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.
