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arXiv 1502.05642hep-phnucl-th
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恢复色偶极子QCD演化中的双周期

Resumming double logarithms in the QCD evolution of color dipoles

E. Iancu, J. D. Madrigal, A. H. Mueller, G. Soyez, D. N. Triantafyllopoulos

摘要:

由于双共线微扰增强了辐射修正,使得高阶微扰修正对高能QCD中BFKL演化的影响超出了对数精度,存在严重的收敛不足问题。通过在光锥(时间有序)微扰理论中对费曼图的显式计算,我们证明了由双微扰(能量共线或双共线)增强的修正与严格有序的软胶子发射有关.这些修正可以通过求解非局域快度演化方程来表示。该方程可以等价地改写为局部形式,但修改了核和初始条件,将双共线对数求和到所有阶。我们将这一重申推广到次首阶BFKL和BK方程。共线改进的BK方程的第一个数值研究表明,在稳定和减缓发展的重定的重要作用。

英文摘要:

The higher-order perturbative corrections, beyond leading logarithmic accuracy, to the BFKL evolution in QCD at high energy are well known to suffer from a severe lack-of-convergence problem, due to radiative corrections enhanced by double collinear logarithms. Via an explicit calculation of Feynman graphs in light cone (time-ordered) perturbation theory, we show that the corrections enhanced by double logarithms (either energy-collinear, or double collinear) are associated with soft gluon emissions which are strictly ordered in lifetime. These corrections can be resummed to all orders by solving an evolution equation which is non-local in rapidity. This equation can be equivalently rewritten in local form, but with modified kernel and initial conditions, which resum double collinear logs to all orders. We extend this resummation to the next-to-leading order BFKL and BK equations. The first numerical studies of the collinearly-improved BK equation demonstrate the essential role of the resummation in both stabilizing and slowing down the evolution.

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