AI 中文总结
利用SIDDHARTA-2实验在DAΦNE对撞机上，基于237 pb⁻¹积分亮度，对K介子氢X射线跃迁进行高精度测量，得到迄今最精确的1s能级位移和宽度值，加强了对低能反K介子-核子相互作用理论描述的实验约束。
AI 中文摘要
K介子原子为低能区强相互作用提供了独特的实验探针。特别是，K介子氢中强相互作用引起的位移（$\varepsilon_{1\text{s}}$）和宽度（$\Gamma_{1\text{s}}$）直接限制了阈值处的低能反K介子-核子（$\bar{K}N$）相互作用以及$\Lambda$(1405)共振的理论描述。我们报告了SIDDHARTA-2实验在DA$\Phi$NE对撞机（INFN-LNF）上对K介子氢X射线跃迁进行的新的高精度测量，基于237 pb$^{-1}$的积分亮度。提取的值，$\varepsilon_{1\text{s}}\,=\,-303.0\,\pm\,17.0\,(统计)\,\pm\,2.5\,(系统)$ eV和$\Gamma_{1\text{s}}\,=\,607\,\pm\,62\,(统计)\,\pm\,6\,(系统)$ eV，是迄今为止最精确的测定，相对于之前的SIDDHARTA测量精度提高了约两倍。这些结果显著加强了对低能$\bar{K}N$相互作用理论描述的实验约束。
英文摘要
Kaonic atoms provide a unique experimental probe of strong interaction in the low-energy regime. In particular, the strong-interaction-induced shift ($\varepsilon_{1\text{s}}$) and width ($Γ_{1\text{s}}$) of kaonic hydrogen directly constrain the low-energy antikaon-nucleon ($\bar{K}N$) interaction at threshold and the theoretical description of the $Λ$(1405) resonance. We report a new high-precision measurement of kaonic hydrogen X-ray transitions performed by the SIDDHARTA-2 experiment at the DA$Φ$NE collider (INFN-LNF), based on an integrated luminosity of 237 pb$^{-1}$. The extracted values, $\varepsilon_{1\text{s}}\,=\,-303.0\,\pm\,17.0\,(stat.)\,\pm\,2.5\,(syst.)$ eV and $Γ_{1\text{s}}\,=\,607\,\pm\,62\,(stat.)\,\pm\,6\,(syst.)$ eV, represent the most precise determination to date, improving the precision by approximately a factor-of-two with respect to the previous SIDDHARTA measurement. These results significantly tighten the experimental constraints on theoretical description of the low-energy $\bar{K}N$ interaction.
