首次测量K⁻d和K⁺d系统的强相互作用散射参数
First measurement of the strong interaction scattering parameters for the $\mathbf{K^-d}$ and $\mathbf{K^+d}$ systems
AI总结：
首次测量K⁻d和K⁺d系统的强相互作用散射参数，为低能QCD动力学提供实验基准。
摘要：
带电K-氘核相互作用为研究低能情况下QCD的 strangeness 部分提供了灵敏探测，特别是通过其散射参数。尽管已有理论预测，但实验约束仍缺失，尤其是K⁻d系统。本文呈现了由ALICE实验在LHC上记录的，发生在√sNN=5.02 TeV的Pb-Pb碰撞中，K⁻d⊕K⁺d̄和K⁺d⊕K⁻d̄粒子对的费米斯科尔函数首次测量。这两种系统的相关函数在三个中心性类别中分析，并利用Lednický-Lyuboshitz模型拟合，以提取源大小和强相互作用散射长度。K⁻d的散射长度实部为Re f0=-1.44±0.15(stat.)+0.10-0.10(sys.)fm，虚部为Im f0=1.34±0.33(stat.)+0.21-0.15(sys.)fm，而K⁺d的实部为Re f0=-0.68±0.16(stat.)+0.09-0.09(sys.)fm。这些结果为低能K±d相互作用建模提供了首次实验约束，为测试chiral QCD动力学提供了长期期待的实验基准。
英文摘要：
Charged kaon--deuteron interactions offer a sensitive probe of the strangeness sector of QCD at low energy, particularly through their scattering parameters. Despite available theoretical predictions, experimental constraints remain absent, particularly for the $\rm K^{-}d$ system. The first measurement of femtoscopic correlation functions for $\rm K^{-}d \oplus K^{+}\overline{d}$ and $\rm K^{+}d \oplus K^{-}\overline{d}$ particle pairs in Pb--Pb collisions at $\sqrt{s_{\rm NN}}=5.02$ TeV recorded by ALICE at the LHC is presented. Correlation functions for both systems are analyzed in three centrality classes and fitted using the Lednický--Lyuboshitz model to extract the source size and strong interaction scattering lengths. The $\rm K^{-}d$ scattering length is found to be $\Re f_0 = -1.44 \pm 0.15\text{ (stat.)}^{+0.10}_{-0.10}$ (syst.) fm and $\Im f_0 = 1.34 \pm 0.33$ (stat.)$^{+0.21}_{-0.15}$ (syst.) fm, while for $\rm K^{+}d$ the value $\Re f_0 = -0.68 \pm 0.16$ (stat.)$^{+0.09}_{-0.09}$ (syst.) fm is obtained. These results provide the first constraints on the $\rm K^{\pm} d$ interaction modeling at low energy, delivering a long-awaited experimental benchmark for testing chiral QCD dynamics.
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