论文标题
在$ p \ bar p \rightarrowλ\barλη$反应中研究$λ^*$共振
Studying $Λ^*$ resonances in the $p \bar p \rightarrow Λ\barΛη$ reaction
论文作者
论文摘要
在这项工作中，我们对在有效的Lagrangian方法和异荷兰模型中，对抗蛋白束能量从阈值到4GEV的$ p \ bar p \rightarrowλ\barλη$进行了理论研究。通过假设该反应是由中间状态下的$λ$和$ \babλ$共振的激发主导的，我们计算了总横截面，并给出了最终粒子的角度分布和不变质谱的预测。特别是，我们讨论了在当前反应中验证$ k^ - p \ toηλ$过程中存在狭窄$λ$共振的可能性。它表明，$ p \ bar p \ rightarrow \barλλη$反应可以为我们提供有关$λ$共振的有价值的信息，该共鸣与$ \ bar k n $和$λη$通道。因此，该反应的实验数据将是用于研究$λ$共振的$ \ bar k n \ toηλ$散射数据的良好补充。
In this work, we make a theoretical study on the $p \bar p \rightarrow Λ\barΛη$ reaction for antiproton beam energy from threshold to 4GeV within an effective Lagrangian approach and isobar model. By assuming this reaction is dominated by the excitation of $Λ$ and $\bar Λ$ resonances in intermediate states, we calculate the total cross sections and give the predictions of the angular distribution and invariant mass spectrum of final particles. In particular, we discuss the possibility to verify the existence of a narrow $Λ$ resonance found in the process of $K^- p\to ηΛ$ in the present reaction. It shows that the $p \bar p \rightarrow \bar ΛΛη$ reaction can provide us with valuable information about the $Λ$ resonances having significant couplings to $\bar K N$ and $Λη$ channels. Thus the experimental data of this reaction will be a good supplement to the $\bar K N\toηΛ$ scattering data for studying $Λ$ resonances.
