arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 0704.3668nucl-thhep-ph
收藏

从介子交换和夸克-胶子动力学研究Dbar-N相互作用

Dbar-N interaction from meson-exchange and quark-gluon dynamics

J. Haidenbauer, G. Krein, Ulf-G. Meißner, A. Sibirtsev

摘要:

我们研究了低能量下的Dbar-N相互作用,使用一个介子交换模型补充了一个短距离的贡献,从一个胶子交换。该模型是在密切类似的Juelich群利用SU(4)对称性约束的介子交换KN相互作用。相互作用的主要成分由矢量介子(ρ,ω)交换和涉及D*N,DΔ和D*Δ中间态的高阶盒图提供。短程部分被假定为从真正的夸克-胶子过程中得到额外的贡献。预测的截面为Dbar-N的过剩能量高达150兆电子伏是相同的数量级为KN,但平均值约为20毫巴,大约一个因素比后者的系统。研究发现,ω交换起着非常重要的作用。它与ρ交换的干涉模式,基本上由假设的SU(4)对称性固定,清楚地决定了Dbar-N相互作用的定性特征--与KN系统发生的情况非常相似。

英文摘要:

We investigate the Dbar-N interaction at low energies using a meson-exchange model supplemented with a short-distance contribution from one-gluon-exchange. The model is developed in close analogy to the meson-exchange KN interaction of the Juelich group utilizing SU(4) symmetry constraints. The main ingredients of the interaction are provided by vector meson (rho, omega) exchange and higher-order box diagrams involving D*N, DΔ, and D*Δintermediate states. The short range part is assumed to receive additional contributions from genuine quark-gluon processes. The predicted cross sections for Dbar-N for excess energies up to 150 MeV are of the same order of magnitude as those for KN but with average values of around 20 mb, roughly a factor two larger than for the latter system. It is found that the omega-exchange plays a very important role. Its interference pattern with the rho-exchange, which is basically fixed by the assumed SU(4) symmetry, clearly determines the qualitative features of the Dbar-N interaction -- very similiar to what happens also for the KN system.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑