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arXiv 1402.4412hep-phhep-th
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高能QCD从Slavnov-Taylor恒等式的演化

High-energy QCD evolution from Slavnov-Taylor identity

A. Quadri

摘要:

阐明了从QCD的基本规范对称性出发导出高能QCD演化方程的方法。色玻璃凝聚体(CGC)的规范固定经典作用量在适当的BRST对称性下是不变的,BRST对称性在胶子模分离为快经典(背景)部分、软分量和半快分量后成立,在其上进行一步量子演化.由此产生的Slavnov-Taylor(ST)恒等式适用于微扰理论中的所有阶次,并强烈约束了由软模积分产生的CGC有效场论(EFT)。我们表明,ST身份保证规范不变性的EFT。它还允许控制半快模式(通常是显式计算中的光锥规范)对规范固定选择的依赖性。在不同的制度(BKFL,JIMWLK,.)有效的发展方程的形式属性。都可以在这个代数方法的统一设置中导出。

英文摘要:

We clarify the derivation of high-energy QCD evolution equations from the fundamental gauge symmetry of QCD. The gauge-fixed classical action of the Color Glass Condensate (CGC) is shown to be invariant under a suitable BRST symmetry, that holds after the separation of the gluon modes into their fast classical (background) part, the soft component and the semifast one, over which the one-step quantum evolution is carried out. The resulting Slavnov-Taylor (ST) identity holds to all orders in perturbation theory and strongly constrains the CGC effective field theory (EFT) arising from the integration of the soft modes. We show that the ST identity guarantees gauge-invariance of the EFT. It also allows to control the dependence on the gauge-fixing choice for the semifast modes (usually the lightcone gauge in explicit computations). The formal properties of the evolution equations valid in different regimes (BKFL, JIMWLK, ...) can be all derived in a unified setting within this algebraic approach.

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