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arXiv 1810.04883nucl-th
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手征有效场论导出的$ΞN$相互作用的介质内性质

In-medium properties of a $ΞN$ interaction derived from chiral effective field theory

J. Haidenbauer, U. -G. Meißner

摘要:

本文研究了在手征有效场论中导出的奇异$S=-2$扇区中重子-重子相互作用的介质内性质。所考虑的$ΞN$的相互作用是符合现有的经验约束的$ΛΛ$ $S$ -波散射长度和$ΞN$弹性和非弹性截面。特别地,在$ΞN$系统中不存在近阈值束缚态。一个传统的$G$矩阵计算这种相互作用进行,并揭示了核物质中的$Ξ$ -超子的单粒子势是适度的吸引力,最近的实验证据表明存在$Ξ$ -超核。

英文摘要:

The in-medium properties of a baryon-baryon interaction for the strangeness $S=-2$ sector derived within chiral effective field theory up to next-to-leading order are investigated. The considered $ΞN$ interaction is in line with available empirical constraints on the $ΛΛ$ $S$-wave scattering length and on $ΞN$ elastic and inelastic cross sections. In particular, there are no near-threshold bound states in the $ΞN$ system. A conventional $G$-matrix calculation for this interaction is performed and reveals that the single-particle potential of the $Ξ$-hyperon in nuclear matter is moderately attractive as suggested by recent experimental evidence for the existence of $Ξ$-hypernuclei.

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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