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arXiv 0903.0294hep-ph
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Pade理论在重夸克真空极化中的应用

Pade Theory applied to the vacuum polarization of a heavy quark

P. Masjuan, S. Peris

摘要:

当用外动量q^2来考虑时,夸克的真空极化是斯蒂尔捷斯型函数。因此,帕德逼近的数学理论保证了在任何远离物理切割的q^2的有限值处,全函数都可以从它在q^2=0附近的低能幂展开重建出来。我们通过将这个理论应用于重夸克的真空极化来说明这一点,并得到了控制O(α_s^2)阶阈值膨胀的常数K^(2)的值。

英文摘要:

The vacuum polarization of a quark, when considered in terms of the external momentum q^2, is a function of the Stieltjes type. Consequently, the mathematical theory of Pade Approximants assures that the full function, at any finite value of q^2 away from the physical cut, can be reconstructed from its low-energy power expansion around q^2=0. We illustrate this point by applying this theory to the vacuum polarization of a heavy quark and obtain the value of the constant K^(2) governing the threshold expansion at order O(alpha_s^2).

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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