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arXiv 0803.4214hep-phnucl-th
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重夸克质量的红外重整化群流

Infrared Renormalization Group Flow for Heavy Quark Masses

Andre H. Hoang, Ambar Jain, Ignazio Scimemi, Iain W. Stewart

摘要:

一个短距离重夸克的质量取决于两个参数,重整化尺度μ控制着紫外线波动吸收到质量中,而R控制着红外线波动的吸收。1/R可以被认为是微扰修正的半径,微扰修正使质量超过极点方案中的点状定义。把R当作一个变量,就得到一个重整化群方程。我们认为,这种反常维数的符号是普遍的:增加R增加IR模式减少m(R)。该流程提高了质量方案之间转换的稳定性,使我们能够避免大的日志和renormalon。R中的流可以用来研究IR重整化子,而不需要使用泡链,我们用它来确定Lambda QCD重整化子的极点质量模糊系数,并采用收敛求和规则。

英文摘要:

A short-distance heavy quark mass depends on two parameters, the renormalization scale mu controlling the absorption of ultraviolet fluctuations into the mass, and a scale R controlling the absorption of infrared fluctuations. 1/R can be thought of as the radius for perturbative corrections that build up the mass beyond its point-like definition in the pole scheme. Treating R as a variable gives a renormalization group equation. We argue that the sign of this anomalous dimension is universal: increasing R to add IR modes decreases m(R). The flow improves the stability of conversions between mass schemes, allowing us to avoid large logs and the renormalon. The flow in R can be used to study IR renormalons without using bubble chains, and we use it to determine the coefficient of the LambdaQCD renormalon ambiguity of the pole mass with a convergent sum-rule.

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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