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arXiv 1302.6889hep-phhep-exhep-latnucl-exnucl-th
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相对论性夸克模型中八重态到十重态的电磁跃迁

Octet to decuplet electromagnetic transition 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到十重态的重子电磁跃迁,并预言了涉及奇异重子的跃迁磁偶极子形状因子。利用SU(3)对称性,在$γ^\ast N \to Δ$反应的基础上,用π云修正补充了价夸克的贡献。虽然价夸克的贡献在一般情况下占主导地位,介子云的影响是非常重要的描述实验数据。通过对奇异十重态重子辐射衰变宽度的分析,我们还发现,除π介子外的其它介子,特别是K介子,可能与某些反应有关,如$γ^\ast Σ^+ \to Σ^{*+}$.

英文摘要:

We study the octet to decuplet baryon electromagnetic transitions using the covariant spectator quark model, and predict the transition magnetic dipole form factors for those involving the strange baryons. Utilizing SU(3) symmetry, the valence quark contributions are supplemented by the pion cloud dressing based on the one estimated in the $γ^\ast N \to Δ$ reaction. Although the valence quark contributions are dominant in general, the pion cloud effects turn out to be very important to describe the experimental data. We also show that, other mesons besides the pion in particular the kaon, may be relevant for some reactions such as $γ^\ast Σ^+ \to Σ^{*+}$, based on our analysis for the radiative decay widths of the strange decuplet baryons.

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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