纯规范下QCD背景场方法中的规范固定恒等式
Gauge Fixing Identity in the Background Field Method of QCD in Pure Gauge
摘要：
本文通过改变纯规范QCD背景场方法中$Z[A,J,η, {\bar η}]$中协变的规范固定项，导出了一个规范固定恒等式。利用这个规范固定恒等式，我们建立了QCD中的$Z[J,η,{\bar η}]$与纯规范下QCD背景场方法中的$Z[A,J,η, {\bar η}]$之间的关系。我们证明了这个规范固定恒等式在一般非协变和一般库仑规范固定中的有效性。这个规范固定恒等式被用来证明高能对撞机上QCD和高能重离子对撞机上非平衡QCD中的因式分解定理。
英文摘要：
In this paper we derive a gauge fixing identity by varying the covariant gauge fixing term in $Z[A,J,η, {\bar η}]$ in the background field method of QCD in pure gauge. Using this gauge fixing identity we establish a relation between $Z[J,η,{\bar η}]$ in QCD and $Z[A,J,η, {\bar η}]$ in background field method of QCD in pure gauge. We show the validity of this gauge fixing identity in general non-covariant and general Coulomb gauge fixings respectively. This gauge fixing identity is used to prove factorization theorem in QCD at high energy colliders and in non-equilibrium QCD at high energy heavy-ion colliders.
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