PANDA/FAIR上粲重子产生的理论研究

近年来，Belle，BABAR和CLEO合作组在正负电子对撞实验中发现了一系列新的粲重子，对于它们内部结构的解释还存在巨大的争议。PANDA/FAIR利用质子—反质子散射为研究这些粲重子提供了一种全新的实验手段。面临这个重大机遇，我们有必要预先对PANDA/FAIR上粲重子的产生进行理论研究，目前这方面的理论计算还较为缺乏。本项目将以介子交换模型为基础研究各种粲重子激发态在几个主要的反质子－质子反应道中的贡献，并且给出关于反应总截面，微分截面，各种动量和角分布以及末态粒子不变质量谱和达立兹图等物理信息的理论预言，大致估计出各个反应道的事例率。可以预计这些结果将为以后在PANDA/FAIR上精确确定各种粲重子激发态的物理特征提供有价值的理论信息。

In the past few years, several new charmed baryons have been observed in electron-positron collision experiments by Belle, BABAR, and CLEO. However, there is a great deal of controversy about their internal structures. The forthcoming experiments by proton-antiproton collisions at PANDA/FAIR will provide a novel and powerful experimental approach for studying these charmed baryons. Faced with this great opportunity, we need to carry out theoretical studies on charmed baryon production at PANDA/FAIR in advance, since theoretical calculations in this respect are still sparse. Based on a meson-exchange model, we will study contributions of various charmed baryons in a couple of proton-antiproton reactions, and give theoretical predictions of various observables for these reactions, such as total cross sections, differential cross sections, momentum and angular distributions, invariant mass spectra and Dalitz plots. Furthermore, we will evaluate the event rate of every channel. It can be anticipated that these results.would provide valuable information for accurate determination of charmed baryon identity at PANDA/FAIR in the future.