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arXiv 1003.0482hep-ph
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小x下依赖横动量的部分子分布的非普适性

Non-Universality of Transverse Momentum Dependent Parton Distributions at Small-x

Bo-Wen Xiao, Feng Yuan

摘要:

通过比较pA碰撞中双射关联中的初/末态相互作用效应和轻子核深度非弹性散射中的初/末态相互作用效应,研究了小x下部分子横动量分布的普适性问题.我们证明了非普适性,在一个特定的模型中,多个规范玻色子交换贡献的总和为所有订单进行明确的计算。我们评论的影响,我们的结果的理论解释dA碰撞中的双强子关联的深度非弹性轻子核散射的饱和现象。

英文摘要:

We study the universality issue of the transverse momentum dependent parton distributions at small-x, by comparing the initial/final state interaction effects in dijet-correlation in pA collisions with those in deep inelastic lepton nucleus scattering. We demonstrate the non-universality by performing an explicit calculation in a particular model where the multiple gauge boson exchange contributions are summed up to all orders. We comment on the implications of our results on the theoretical interpretation of di-hadron correlation in dA collisions in terms of the saturation phenomena in deep inelastic lepton nucleus scattering.

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