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arXiv 1005.5683hep-ph
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量子色动力学中的有理逼近

Rational Approximations in Quantum Chromodynamics

Pere Masjuan

摘要:

讨论了量子色动力学中有关有理逼近的一些问题,特别是与Padé逼近的数学理论有关的问题。我们主要研究两类问题:第一类是与亚纯函数有关的问题(受QCD中大Nc极限的启发),通过提取两点格林函数的低能常数和凝聚参数,探索最小强子近似;第二个与Stieltjes的亚纯函数有关,本文对线性西格玛模型中的么正化过程进行了批判性的分析,并将Padé理论应用于重夸克的真空极化函数。我们还显示了这些近似的能力时,与实验数据。在此基础上,着重讨论了该理论对控制系统误差的可靠性。

英文摘要:

We discuss some topics concerning rational approximations in Quantum Chromodynamics, especially those related with the mathematical theory of Padé Approximants. We focus on two kind of problems: the first one related with meromorphic functions (inspired by the Large-Nc limit in QCD) where we explore the Minimal Hadronic Approximation through the extraction of Low-Energy Constants and Condensate parameters of a two-point Green's function; and the second one related with meromorphic functions of Stieltjes-type where we present a critical analysis to a unitarization process applied to the Linear Sigma Model and also and application of the Padé Theory to the vacuum polarization function of a heavy quark. We also show the ability of these approximations when working with experimental data. Along these line, we make special emphasis on the reliability of that theory to control on systematic errors.

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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