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arXiv 1301.4035hep-ph
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扩展线性西格玛模型简报

Brief Report on the Extended Linear Sigma Model

Anja Habersetzer

摘要:

我们提出了一个手征有效模型,它表现出所有已知的对称性特征的QCD拉格朗日。扩展的线性西格玛模型(eLSM)包括(赝)标量和(轴)矢量介子、胶球和重子。它已被证明是一个有用的工具,以了解低能量共振的性质。它可以用来描述已知的低能介子的质量和衰变宽度,并解开低能范围内复杂的共振图像。我们可以回答低能区的一些悬而未决的问题,例如共振(f_0(1500))是一个主要的胶球态,共振(f_0(1370))最有可能是π介子的手征伙伴。我们还可以发现,共振(N(1650))有利于作为核子(N(939))的手征伙伴。此外,手征凝聚体和胶球凝聚体的温度依赖性可以用来研究非零温度和密度下的相图。在非零密度时,我们达到核物质饱和。

英文摘要:

We present a chiral effective model which exhibits all the known symmetry features of the QCD Lagrangian. The extended Linear Sigma Model (eLSM) includes (pseudo-)scalar and (axial-) vector mesons, glueballs, and baryons. It has proven to be a useful tool to understand the nature of the low-energy resonances. It can be used to describe the masses and decay widths of the known low-energy mesons and to disentangle the complicated picture of resonances in the low-energy range. We can answer some of the open questions in the low-energy region, e.g. the resonance (f_0(1500)) is a predominantly glueball state and the resonance (f_0(1370)) is most likely the chiral partner of the pion. We could also find that the resonance (N(1650)) is favoured as the chiral partner of the nucleon (N(939)). In addition the temperature dependence of the chiral condensate and the glueball condensate can be used to study the phase diagram at nonzero temperatures and densities. At nonzero density we achieve nuclear matter saturation.

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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