Renormalon-free definition of the gluon condensate within the large-$\beta_0$ approximation

Renormalon-free definition of the gluon condensate within the large-$\beta_0$ approximation
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大$eta_0$ 近似内胶子凝聚态的无重整化定义

DOI:
10.1093/ptep/ptz100
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发表时间:
2018
影响因子:
3.5
通讯作者:
H. Takaura
H. Takaura
中科院分区:
物理与天体物理4区
文献类型:
--
作者:
Hiroshi Suzuki;H. Takaura

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我们在大β近似下给出了胶子凝聚的一个明确的定义,试图对胶子凝聚进行系统的讨论。我们定义的胶子凝聚体,使它是免费的重整化不确定性,符合重整化尺度独立的每一项的运营商产品的扩展(OPE),和一个相同的对象无关的可观。利用最近提出的解析公式,从微扰计算中分离出了使胶子凝聚不确定的重正化不确定度O(\Lambda ^4)。在OPE中,重正化子不确定度被吸收到胶子凝聚中,使胶子凝聚不受重正化子不确定度的影响。因此,我们可以用无重正马龙的方法定义OPE。在此基础上,我们讨论了利用Yang-Mills梯度流定义的能量密度算符的格点数据,数值提取胶子凝聚体的方法。
We propose a clear definition of the gluon condensate within the large-$\beta_0$ approximation as an attempt toward a systematic argument on the gluon condensate. We define the gluon condensate such that it is free from a renormalon uncertainty, consistent with the renormalization scale independence of each term of the operator product expansion (OPE), and an identical object irrespective of observables. The renormalon uncertainty of $\mathcal{O}(\Lambda^4)$, which renders the gluon condensate ambiguous, is separated from a perturbative calculation by using a recently suggested analytic formulation. The renormalon uncertainty is absorbed into the gluon condensate in the OPE, which makes the gluon condensate free from the renormalon uncertainty. As a result, we can define the OPE in a renormalon-free way. Based on this renormalon-free OPE formula, we discuss numerical extraction of the gluon condensate using the lattice data of the energy density operator defined by the Yang–Mills gradient flow.
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