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arXiv 0901.2873hep-ph
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具有饱和边界的BFKL和CCFM演化

BFKL and CCFM evolutions with saturation boundary

Emil Avsar, Edmond Iancu

摘要:

我们对补充有模拟饱和的吸收边界的未积分胶子分布的BFKL和CCFM方程进行了数值研究。对于BFKL方程,对于固定耦合和运行耦合,以及对于所有考虑的能量,该过程对于饱和动量和饱和以上的胶子分布产生与非线性BK方程相同的结果。这种相似性超出了基于与统计物理学的对应关系的预期,统计物理学仅适用于固定耦合和渐近高能量。对于CCFM方程,其非线性推广是未知的,我们的方法提供了第一次研究的方法走向饱和。我们发现,在运行耦合的情况下,CCFM和BFKL预测的饱和动量的能量依赖性是相同的,在我们的数值精度。一个类似的饱和边界可以很容易地实现在CCFM为基础的蒙特卡罗事件发生器,所以像级联。

英文摘要:

We perform numerical studies of the BFKL and CCFM equations for the unintegrated gluon distribution supplemented with an absorptive boundary which mimics saturation. For the BFKL equation, this procedure yields the same results for the saturation momentum and the gluon distribution above saturation as the non-linear BK equation, for both fixed and running coupling, and for all the considered energies. This similarity goes beyond expectations based on the correspondence with statistical physics, which hold only for fixed coupling and asymptotically high energies. For the CCFM equation, whose non-linear generalization is not known, our method provides the first study of the approach towards saturation. We find that, in the running-coupling case, the CCFM and BFKL predictions for the energy dependence of the saturation momentum are identical within our numerical accuracy. A similar saturation boundary could be easily implemented in the CCFM-based Monte Carlo event generators, so like CASCADE.

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