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arXiv 1902.08844hep-phhep-exnucl-exnucl-th
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核介质中八重态重子电磁形状因子双比$(G_E^\ast/G_M^\ast)/(G_E/G_M)$

Octet baryon electromagnetic form factor double ratios $(G_E^\ast/G_M^\ast)/(G_E/G_M)$ in a nuclear medium

G. Ramalho, J. P. B. C. de Melo, K. Tsushima

备注：
Version published in Phys. Rev. D. The discussions are extended. 11 pages, 6 figures
发表信息：
Phys. Rev. D 100, 014030 (2019)
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摘要：

重子电（$G_E$）与磁（$G_M$）形状因子之比$G_E/G_M$可以为我们提供关于真空中重子结构的重要信息，最近的质子和中子系统的研究已经证明了这一点。有人认为，相应的在介质中的比率，$G_E^\ast/G_M^\ast$，也可以提供有用的信息，在核介质中的重子的电磁结构。虽然目前除了质子外，还不能直接在实验中测量到这些比值，但双比值$(G_E^\ast/G_M^\ast)/(G_E/G_M)$可以直接与束缚重子的极化转移测量相联系。本文首次估计了对称核物质中所有八重态重子在$Q^2=0$ -3 GeV $^2$范围内的双比$(G_E^\ast/G_M^\ast)/(G_E/G_M)$，其中$Q^2=- q^2$和$q$是四动量转移.

英文摘要：

The ratios of the baryon electric ($G_E$) to magnetic ($G_M$) form factors, $G_E/G_M$, can provide us with important information on the structure of baryons in vacuum as demonstrated in recent studies for the proton and neutron systems. It has been argued that the corresponding in-medium ratios, $G_E^\ast/G_M^\ast$, can also provide useful information on the electromagnetic structure of baryons in a nuclear medium. Although the ratios may not be measured directly in experiments except for the proton at present, the double ratios $(G_E^\ast/G_M^\ast)/(G_E/G_M)$ can be directly related to the polarization-transfer measurements of bound baryons. In the present work we estimate, for the first time, the double ratios $(G_E^\ast/G_M^\ast)/(G_E/G_M)$ for all the members of octet baryons in symmetric nuclear matter in the range $Q^2=0$--3 GeV$^2$, where $Q^2=- q^2$ with $q$ being the four-momentum transfer.

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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