$\vec{p}p \rightarrow pK^{+}Λ$反应末态相互作用中自旋三重态$pΛ$散射长度的首次模型无关测量
First Model-Independent Measurement of the Spin Triplet $pΛ$ Scattering Length from Final State Interaction in the $\vec{p}p \rightarrow pK^{+}Λ$ Reaction
摘要：
在$2.7\,\mathrm{GeV}/c$的束动量下，用COSY-TOF检测器测量了$\vec{p}p \rightarrow pK^{+}Λ$反应。极化质子束能够通过产生的K介子（$A_N^{K}$）的不对称性来测量束分析功率。这个可观察到的允许$pΛ$自旋三重态散射长度被提取的第一时间模型独立于反应中的最终状态相互作用。获得的值为$a_{t} = (-2.55 ^{+0.72}_{-1.39} {}_{\textrm{stat.}} \pm 0.6_{\textrm{syst.}} \pm 0.3_{\textrm{theo.}})\mathrm{fm}$。该值与理论预测和模型相关分析的结果一致。
英文摘要：
The $\vec{p}p \rightarrow pK^{+}Λ$ reaction has been measured with the COSY-TOF detector at a beam momentum of $2.7\,\mathrm{GeV}/c$. The polarized proton beam enables the measurement of the beam analyzing power by the asymmetry of the produced kaon ($A_N^{K}$). This observable allows the $pΛ$ spin triplet scattering length to be extracted for the first time model independently from the final-state interaction in the reaction. The obtained value is $a_{t} = (-2.55 ^{+0.72}_{-1.39} {}_{\textrm{stat.}} \pm 0.6_{\textrm{syst.}} \pm 0.3_{\textrm{theo.}})\mathrm{fm}$. This value is compatible with theoretical predictions and results from model-dependent analyses.
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