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arXiv 0902.1986nucl-thhep-ph
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多核子长程和短程相互作用核物质的手征有效场论

Chiral Effective Field Theory for Nuclear Matter with long- and short-range Multi-Nucleon Interactions

J. A. Oller, A. Lacour, U. -G. Meißner

摘要:

本文导出了一种新的适用于介质内手征微扰理论的手征功率计数方案。它允许考虑到本地以及介子介导的核子间相互作用的系统扩展。基于这种功率计数,可以识别需要重新计算的非微扰图的类别。在此方案下,对非对称核物质中的π介子自能进行了分析和计算。结果表明,介质中核子-核子相互作用的修正在非线性光学处相互抵消。因此,介质中π介子自能的线性密度近似在这个量级上没有修正。

英文摘要:

We derive a novel chiral power counting scheme for in-medium chiral perturbation theory with explicit nucleonic and pionic degrees of freedom coupled to external sources. It allows for a systematic expansion taking into account local as well as pion-mediated inter-nucleon interactions. Based on this power counting, one can identify classes of non-perturbative diagrams that require a resummation. Within this scheme, the pion self-energy in asymmetric nuclear matter is analyzed and calculated up-to-and-including next-to-leading order (NLO). It is shown that the corrections involving in-medium nucleon-nucleon interactions cancel between each other at NLO. As a result, there are no corrections up to this order to the linear density approximation for the in-medium pion self-energy.

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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