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arXiv 1207.2640hep-phnucl-th
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自旋-味相关相互作用对轻味重子螺旋度振幅的影响

Effects of a spin-flavour dependent interaction on light-flavoured baryon helicity amplitudes

Michael Ronniger, Bernard Ch. Metsch

摘要:

本文是前人工作的继续,研究了基于Salpeter方程的相对论协变组分夸克模型中唯象味相关力对轻味重子共振结构的影响。本文计算了核子和$Δ$共振电激发中实验研究的纵向和横向螺旋度振幅。特别地,将如在先前模型$\mathcal A$中计算的用于激发三个和四个星共振的振幅与新颖模型$\mathcal C$的振幅以及与现有的和部分新的实验数据(例如由CB-ELSA协作确定的)进行比较。在介绍模型的基础上,简要讨论了对模型$\mathcal C$的一些改进。

英文摘要:

This paper is a continuation of previous work about the effects of a phenomenological flavour dependent force in a relativistically covariant constituent quark model based on the Salpeter equation on the structure of light-flavoured baryon resonances. Here the longitudinal and transverse helicity amplitudes as studied experimentally in the electro-excitation of nucleon- and $Δ$ resonances are calculated. In particular the amplitudes for the excitation of three and four star resonances as calculated in a previous model $\mathcal A$ are compared to those of the novel model $\mathcal C$ as well as to existing and partially new experimental data such as e.g. determined by the CB-ELSA collaboration. A brief discussion of some improvements to model $\mathcal C$ is given after the introduction.

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。

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