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arXiv 1910.03470hep-ph
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轻重光锥算符的重夸克展开

Heavy quark expansion for heavy-light light-cone operators

Shuai Zhao

摘要:

我们将著名的重夸克展开推广到非定域QCD算符。以光锥上的非定域重-轻流为例,证实了在$1/M$展开的主导幂次下,QCD算符与重夸克有效理论(HQET)中相应的算符具有共线奇异性.基于单圈水平上算符形式的微扰计算,研究了QCD和HQET算符之间的因子分解公式,确定了匹配系数。由此可以导出QCD和HQET光锥分布振幅(LCDAs)以及强子的其他动量分布之间的匹配。

英文摘要:

We generalize the celebrated heavy quark expansion to nonlocal QCD operators. By taking nonlocal heavy-light current on the light-cone as an example, we confirm that the collinear singularities are common between QCD operator and the corresponding operator in heavy quark effective theory (HQET), at the leading power of $1/M$ expansion. Based on a perturbative calculation in operator form at one-loop level, a factorization formula linking QCD and HQET operators is investigated and the matching coefficient is determined. The matching between QCD and HQET light-cone distribution amplitudes (LCDAs) as well as other momentum distributions of hadron can be derived as a consequence.

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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