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arXiv 2406.08065hep-lat
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四夸克算符的规范不变重整化

Gauge-invariant renormalization of four-quark operators

M. Constantinou, M. Costa, H. Herodotou, H. Panagopoulos, G. Spanoudes

AI总结:

本文在单圈微扰理论下采用坐标空间规范不变重整化方案(GIRS)研究四夸克算符的重整化,提取了GIRS与$\overline{\rm MS}$方案间的转换因子,为理解QCD现象、CKM矩阵元精度及四夸克算符复杂混合的非微扰处理提供了见解。

摘要:

我们在单圈微扰理论中研究了四夸克算符的重整化。我们采用了一种坐标空间的规范不变重整化方案(GIRS),与其他方案相比,该方案可能具有优势,特别是在非微扰格点研究中。从我们的微扰计算中,我们提取了次领头阶下GIRS与改进的最小减除方案($\overline{\rm MS}$)之间的转换因子。四夸克算符研究中一个棘手的问题是,具有不同Dirac矩阵的算符在重整化时会相互混合。我们关注改变味数两个单位($\Delta F = 2$)的宇称守恒和宇称破坏四夸克算符。转换因子的提取需要计算包含两个四夸克算符乘积的两点格林函数,以及包含一个四夸克算符和两个双线性算符的三点格林函数。我们结果的意义在于其有望加深对QCD现象的理解,为Cabibbo-Kobayashi-Maskawa(CKM)矩阵元的精度提供见解,并阐明与四夸克算符相关的复杂混合模式的非微扰处理。

英文摘要:

We study the renormalization of four-quark operators in one-loop perturbation theory. We employ a coordinate-space Gauge-Invariant Renormalization Scheme (GIRS), which can be advantageous compared to other schemes, especially in nonperturbative lattice investigations. From our perturbative calculations, we extract the conversion factors between GIRS and the modified Minimal Subtraction scheme ($\overline{\rm MS}$) at the next-to-leading order. A formidable issue in the study of the four-quark operators is that operators with different Dirac matrices mix among themselves upon renormalization. We focus on both parity-conserving and parity-violating four-quark operators, which change flavor numbers by two units ($ΔF = 2$). The extraction of the conversion factors entails the calculation of two-point Green's functions involving products of two four-quark operators, as well as three-point Green's functions with one four-quark and two bilinear operators. The significance of our results lies in their potential to refine our understanding of QCD phenomena, offering insights into the precision of Cabibbo-Kobayashi-Maskawa (CKM) matrix elements and shedding light on the nonperturbative treatment of complex mixing patterns associated with four-quark operators.

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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