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arXiv 1003.0813hep-ph
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测试大N_c极限以上彩色玻璃冷凝物的新观测量

New observables to test the Color Glass Condensate beyond the large-N_c limit

Cyrille Marquet, Heribert Weigert

摘要:

JIMWLK框架为计算高能QCD观测量的能量依赖性提供了一个强有力的工具。尽管越来越多的观测量被认为是现象学分析,JIMWLK演化的一些功能超出了它的演化速度还受到实验的约束。我们认为,介子产生截面有可能提供定性的新见解,并允许解决的问题都超出了大N_c限制和更高的扭曲。这些横截面一般包含四个点的功能,其演变是遵循JIMWLK框架。高斯截断提供了一种计算大N_c极限下四点扩散子演化的有效而实用的方法。

英文摘要:

The JIMWLK framework offers a powerful tool to calculate the energy dependence of QCD observables at high energies. Despite a growing number of observables considered for phenomenological analysis, few features of JIMWLK evolution beyond its evolution speed are yet well constrained by experiment. We argue that meson production cross-sections have the potential to provide qualitatively new insights and allow to address issues both beyond the large-N_c limit and at higher twist. These cross-sections generically contain four point functions whose evolution is shown to follow from the JIMWLK framework. The Gaussian truncation is used to provide an efficient and practical means of calculating the evolution of four point correlators beyond the large-N_c limit.

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