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arXiv 0806.4551hep-ph
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γ^*γ碰撞中QCD因子分解机制的对偶性

Duality between different mechanisms of QCD factorization in γ^*γcollisions

I. V. Anikin, I. O. Cherednikov, N. G. Stefanis, O. V. Teryaev

摘要:

本文研究了QCD分解所适用的硬排他反应中的对偶现象。考虑到标量$ϕ^3_E$模型中的“双光子”过程以及QCD中的实光子(横向极化)和高度虚的纵向极化光子碰撞产生的强子对,我们确定了两种因子分解机制,每种机制都与一种不同的非微扰机制相关联。一种机制涉及扭转-3广义分布振幅,而另一种机制采用领先扭转过渡分布振幅。在标量$ϕ^3_E$模型的情况下,我们发现对偶的运动区域中的两个机制重叠。在QCD的情况下,对偶的外观是敏感的特定的非微扰模型应用,因此,可以作为一个额外的裁决。

英文摘要:

We study the phenomenon of duality in hard exclusive reactions to which QCD factorization applies. Considering "two-photon"-like processes in the scalar $ϕ^3_E$ model and also hadron-pair production from the collisions of a real (transversely polarized) and a highly virtual, longitudinally polarized, photon in QCD, we identify two regimes of factorization each of them associated with a distinct nonperturbative mechanism. One mechanism involves twist-3 Generalized Distribution Amplitudes, whereas the other one employs leading-twist Transition Distribution Amplitudes. In the case of the scalar $ϕ^3_E$ model, we find duality in that kinematical region where the two mechanisms overlap. In the QCD case, the appearance of duality is sensitive to the particular nonperturbative model applied and can, therefore, be used as an additional adjudicator.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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