论文标题
该过程中的最终状态互动$ e^{+} e^{ - } \rightarrowλ_{c} \barλ_{c} $
Final-state interaction in the process $e^{+}e^{-}\rightarrowΛ_{c}\barΛ_{c}$
论文作者
论文摘要
我们表明，最终状态交互解释了该过程的横截面的非平地近阈值能量依赖性$ e^{+} e^{ - } \rightArrowλ_{c} \barλ_{c} $由Belle and Besiii协作观察到。这种能量依赖性是$ s $ - 波和$ d $ - 波的组件的结果，$λ_{c} \barλ_{c} $ wave函数由于张量的交互而引起的。库仑电势仅在狭窄的能量区域很重要，大约高于该过程的阈值。结果表明，广泛使用的假设是，库仑相互作用对强子产生的横截面的影响降低到Sommerfeld-Gamow-Sakharov因子是不正确的。
We show that the final-state interaction explains the nontrivial near-threshold energy dependence of the cross section of the process $e^{+}e^{-}\rightarrowΛ_{c}\barΛ_{c}$ observed by the Belle and BESIII collaborations. This energy dependence is the result of the mixture of $S$-wave and $D$-wave components of the $Λ_{c}\barΛ_{c}$ wave function due to a tensor interaction. The Coulomb potential is important only in the narrow energy region about a few MeV above the threshold of the process. It is shown that the widely used assumption that the impact of the Coulomb interaction on the cross sections of hadron production is reduced to the Sommerfeld-Gamow-Sakharov factor is not correct.
