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arXiv 1102.1890hep-ph
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有无QCD相干效应的小x Monte Carlos的比较研究

A comparative study of small x Monte Carlos with and without QCD coherence effects

G. Chachamis, M. Deak, A. Sabio Vera, P. Stephens

摘要:

我们比较了两个Monte Carlo实现的再确认计划的描述部分子演化在小值的Bjorken x。一种是基于Balitsky-Fadin-Kuraev-Lipatov(BFKL)演化方程,利用正则化胶子产生动量空间中的全微分部分子分布。另一种是基于Catani-Ciafaloni-Fiorani-Marchesini(CCFM)部分子核,其中引入了QCD相干效应。有人认为,这两种方法在x -> 0的限制下彼此一致。我们表明,这是不是方位角依赖量的情况下,因为在高能量的BFKL方法是由其零共形自旋分量占主导地位,而CCFM胶子格林函数接收的贡献,从所有的共形自旋,即使在非常小的x。

英文摘要:

We compare two Monte Carlo implementations of resummation schemes for the description of parton evolution at small values of Bjorken x. One of them is based on the Balitsky-Fadin-Kuraev-Lipatov (BFKL) evolution equation and generates fully differential parton distributions in momentum space making use of reggeized gluons. The other one is based on the Catani-Ciafaloni-Fiorani-Marchesini (CCFM) partonic kernel where QCD coherence effects are introduced. It has been argued that both approaches agree with each other in the x -> 0 limit. We show that this is not the case for azimuthal angle dependent quantities since at high energies the BFKL approach is dominated by its zero conformal spin component while the CCFM gluon Green function receives contributions from all conformal spins even at very small x.

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