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arXiv 1007.0036hep-phhep-th
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次领先阶的高能振幅和影响因子

High-energy amplitudes and impact factors at next-to-leading order

Giovanni Antonio Chirilli

摘要:

为了研究高能下的散射振幅,两个电流的T积可以用保持共形不变性的Wilson线算子构成的“复合色偶极”的系数函数(影响因子)和矩阵元展开.在第一阶,色偶极子的高能演化由非线性Balitsky-Kovchegov(BK)方程控制。为了描述次领先阶(NLO)中的高能振幅,需要知道系数函数(“影响因子”)和相应的威尔逊线算子的演化。利用高能光电子势,我们找到了BK方程的次领先阶(NLO)修正,并计算了虚光子在深度非弹性散射中的影响因子。

英文摘要:

To study scattering amplitudes at high-energy, the T-product of two currents can be expanded in terms of coefficient functions (impact factors) and matrix elements of ``composite color dipoles'' made of Wilson line operators with rapidity cutoff preserving conformal invariance. In the leading order, the high-energy evolution of color dipoles is governed by the non-linear Balitsky-Kovchegov (BK) equation. To describe the high-energy amplitudes in the next-to-leading order (NLO) one needs to know the coefficient function (``impact factor'') and the evolution of corresponding Wilson-line operators. Using the high-energy OPE, we find the next-to-leading order (NLO) correction to the BK equation and calculate the impact factor for virtual photons in deep inelastic scattering.

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