用PANDA确定激发态重子自旋宇称的前景
Prospects for Spin-Parity Determination of Excited Baryons via the $\mathbf{\overlineΞ^+Λ\,K^-}$ Final State with PANDA
摘要：
对重子激发谱的研究有助于深入了解重子的内部结构。世界范围内的大部分努力都是针对$N^*$和$Δ^*$光谱学的。目前还缺乏来自双重和三重奇异重子谱的补充数据，预计在不久的将来将通过PANDA实验获得这些数据。早期的蒙特卡罗研究表明，在$μ$ b量级的预期截面下，PANDA将能够充分观察通道$\bar{p}p\rightarrow \overlineΞ^+Λ\,K^-$，包括两个共振$Ξ\left(1690\right)^-$和$Ξ\left(1820\right)^-$，背景贡献可以忽略不计。在这项研究中，确定的自旋和宇称的$Ξ\left(1690\right)^-$和$Ξ\left(1820\right)^-$共振的可行性进行了研究，通过使用部分波分析，采用PAWIAN软件。所提出的结果表明，PANDA实验的能力，以确定这些共振的自旋宇称与几天的数据。
英文摘要：
A study of the baryon excitation spectra provides a deep insight into the inner structure of baryons. Most of the world-wide efforts have been directed towards $N^*$ and $Δ^*$ spectroscopy. Complementary data from double and triple strange baryon spectra are lacking and foreseen to be obtained with the PANDA experiment in the near future. Earlier Monte Carlo studies demonstrated that with an expected cross section in the order of $μ$b, PANDA will be able to copiously observe the channel $\bar{p}p\rightarrow \overlineΞ^+Λ\,K^-$, including the two resonances $Ξ\left(1690\right)^-$ and $Ξ\left(1820\right)^-$, with a negligible background contribution. In this study, the feasibility to determine the spin and parity of the $Ξ\left(1690\right)^-$ and $Ξ\left(1820\right)^-$ resonances is investigated by making use of a partial wave analysis employing the PAWIAN software. The presented results demonstrate the capability of the PANDA experiment to determine the spin-parity of these resonances with a few days of data taking.
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