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arXiv 0903.5326hep-phhep-th
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N=4 SYM中色偶极子的NLO演化

NLO evolution of color dipoles in N=4 SYM

Ian Balitsky, Giovanni A. Chirilli

摘要:

规范理论中振幅的高能行为可以用威尔逊线算符的演化来重新表述。在领先的对数近似,它是由共形不变BK方程的颜色偶极子的演变。在QCD中,次首阶BK方程具有共形和非共形部分,后者提供了耦合常数的变化。为了将共形不变效应与运行耦合效应分开,我们在共形${\cal N}$ =4 SYM理论中计算了色偶极子的非线性光学演化.我们定义了具有保共形不变性的快度截止的复合偶极算符。这些算子的莫比乌斯不变核与参考文献1的前向NLO BFKL计算一致。

英文摘要:

High-energy behavior of amplitudes in a gauge theory can be reformulated in terms of the evolution of Wilson-line operators. In the leading logarithmic approximation it is given by the conformally invariant BK equation for the evolution of color dipoles. In QCD, the next-to-leading order BK equation has both conformal and non-conformal parts, the latter providing the running of the coupling constant. To separate the conformally invariant effects from the running-coupling effects, we calculate the NLO evolution of the color dipoles in the conformal ${\cal N}$=4 SYM theory. We define the "composite dipole operators" with the rapidity cutoff preserving conformal invariance. The resulting Möbius invariant kernel for these operators agrees with the forward NLO BFKL calculation of Ref. 1.

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