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arXiv 1004.5280hep-ph
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红外区的QCD有效耦合

QCD Effective Coupling in the Infrared Region

Gurjav Ganbold

摘要:

我们在基于解析禁闭的相对论量子场模型中利用传统的介子谱估计了低能区的QCD有效电荷$α_s$。用阶梯Bethe-Salpeter方程求解了两夸克束缚态的质量。我们发现了一个新的,独立的和特定的红外有限行为的QCD耦合低于能量标度1 GeV。特别地,在限制尺度$Λ=345$ MeV的$α_s(0)\simeq 0.757$处提取红外固定点。作为应用,我们估计了一些中重介子的质量,并得到了与最近的实验数据相当一致的结果。

英文摘要:

We estimate the QCD effective charge $α_s$ in the low-energy region by exploiting the conventional meson spectrum within a relativistic quantum-field model based on analytic confinement. The ladder Bethe-Salpeter equation is solved for the masses of two-quark bound states. We found a new, independent and specific infrared-finite behavior of QCD coupling below energy scale 1 GeV. Particularly, an infrared-fixed point is extracted at $α_s(0)\simeq 0.757$ for confinement scale $Λ=345$ MeV. As an application, we estimate masses of some intermediate and heavy mesons and obtain results in reasonable agreement with recent experimental data.

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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