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arXiv 1107.1791hep-phhep-exhep-latnucl-exnucl-th
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相对论夸克模型中八重态重子电磁形状因子

Octet baryon electromagnetic form factors in a relativistic quark model

G. Ramalho, K. Tsushima

摘要:

利用协变旁观者夸克模型研究了八重态重子的电磁性质,给出了可用于重子电磁反应研究的协变参数化。我们用大质量区的格点量子色动力学数据(小介子云效应)确定价夸克区的模型参数,用核子物理和八重态重子磁矩数据确定介子云贡献的参数。八重态重子电磁形状因子的价夸克贡献估计外推的晶格参数化在大π质量制度的物理制度。至于介子云的贡献,我们参数化他们在协变,唯象的方式,结合SU(3)对称性。我们还讨论了π云效应对八重态重子电磁形状因子及其半径的影响。

英文摘要:

We study the octet baryon electromagnetic properties by applying the covariant spectator quark model, and provide covariant parametrization that can be used to study baryon electromagnetic reactions. While we use the lattice QCD data in the large pion mass regime (small pion cloud effects) to determine the parameters of the model in the valence quark sector, we use the nucleon physical and octet baryon magnetic moment data to parameterize the pion cloud contributions. The valence quark contributions for the octet baryon electromagnetic form factors are estimated by extrapolating the lattice parametrization in the large pion mass regime to the physical regime. As for the pion cloud contributions, we parameterize them in a covariant, phenomenological manner, combined with SU(3) symmetry. We also discuss the impact of the pion cloud effects on the octet baryon electromagnetic form factors and their radii.

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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