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arXiv 1301.3013hep-phnucl-th
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三重夸克系统的对称性和NNLL的色单态静能

Symmetries of the Three Heavy-Quark System and the Color-Singlet Static Energy at NNLL

Nora Brambilla, Felix Karbstein, Antonio Vairo

摘要:

在势非相对论QCD的有效场论框架下,研究了三重夸克系统在夸克场交换下的对称性。对称性约束了有效理论中匹配系数的形式。然后,我们把注意力集中在色单重区,并确定迄今为止未知的超软对静电势的贡献,其量级为α_s^4 ln(μ),从而确定其对静电能的贡献,其量级为α_s^4 ln(α_s)。最后,在等边几何的情况下,我们求解了重整化群方程,并在色单重态、八重态和十重态表象下,对三个夸克的静态势进行了超软计算。

英文摘要:

We study the symmetries of the three heavy-quark system under exchange of the quark fields within the effective field theory framework of potential non-relativistic QCD. The symmetries constrain the form of the matching coefficients in the effective theory. We then focus on the color-singlet sector and determine the so far unknown leading ultrasoft contribution to the static potential, which is of order alpha_s^4 ln(μ), and consequently to the static energy, which is of order alpha_s^4 ln(alpha_s). Finally, in the case of an equilateral geometry, we solve the renormalization group equations and resum the leading ultrasoft logarithms for the static potential of three quarks in a color singlet, octet and decuplet representation.

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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