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arXiv 1208.0585hep-phnucl-th
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三味线性西格玛模型中的介子真空现象

Meson vacuum phenomenology in a three-flavor linear sigma model with (axial-)vector mesons

Denis Parganlija, Peter Kovacs, Gyorgy Wolf, Francesco Giacosa, Dirk H. Rischke

摘要:

在具有整体手征$U(N_f)_L \times U(N_f)_R$对称性的线性西格玛模型框架下,研究了非奇异量子数和奇异量子数的标量、赝标量、矢量和轴矢量介子。我们执行一个全球性的介子质量,衰变宽度,以及衰变振幅。对于一个不考虑同位旋破缺效应的强子模型来说,拟合的质量出奇的好。我们还调查的问题是否标量$\bar{q}q$状态低于或高于1 GeV,并发现标量状态高于1 GeV的首选为$\bar{q}q$状态。此外,我们还将轴向矢量共振描述为$\bar{q}q$态。

英文摘要:

We study scalar, pseudoscalar, vector, and axial-vector mesons with non-strange and strange quantum numbers in the framework of a linear sigma model with global chiral $U(N_f)_L \times U(N_f)_R$ symmetry. We perform a global fit of meson masses, decay widths, as well as decay amplitudes. The quality of the fit is, for a hadronic model that does not consider isospin-breaking effects, surprisingly good. We also investigate the question whether the scalar $\bar{q}q$ states lie below or above 1 GeV and find the scalar states above 1 GeV to be preferred as $\bar{q}q$ states. Additionally, we also describe the axial-vector resonances as $\bar{q}q$ states.

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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