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arXiv 2005.14047hep-ph
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QCD和HQET中重夸克场的四圈匹配

Matching the heavy-quark fields in QCD and HQET at four loops

Andrey G. Grozin, Peter Marquard, Alexander V. Smirnov, Vladimir A. Smirnov, Matthias Steinhauser

摘要:

计算了重夸克场的QCD/HQET匹配系数,最多可达四圈。它必须是有限的;这一要求产生了四圈壳重夸克场重整化常数中某些项的解析结果,这些项以前仅在数值上已知。非零较轻风味质量的影响计算多达三个循环。详细分析了一类带两个质量的在壳积分。把我们的结果推广到量子电动力学中,得到了电子场与Bloch-Nordsieck场之间的四圈精度关系。

英文摘要:

The QCD/HQET matching coefficient for the heavy-quark field is calculated up to four loops. It must be finite; this requirement produces analytical results for some terms in the four-loop on-shell heavy-quark field renormalization constant which were previously only known numerically. The effect of a non-zero lighter-flavor mass is calculated up to three loops. A class of on-shell integrals with two masses is analyzed in detail. By specifying our result to QED, we obtain the relation between the electron field and the Bloch--Nordsieck field with four-loop accuracy.

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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