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arXiv 1008.4432hep-phnucl-th
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小-x夸克分布中的初态和末态相互作用效应

Initial and Final State Interaction Effects in Small-x Quark Distributions

Bo-Wen Xiao, Feng Yuan

摘要:

研究了小- $x$饱和区中横动量相关部分子分布的初态和末态相互作用效应。特别地,我们讨论了$pA$碰撞中的半包容深度非弹性散射、Drell-Yan轻子对产生和双喷注关联过程中的夸克分布.我们在标量QED模型中计算了夸克的分布,然后推广到QCD中的色玻璃凝聚形式。在DIS过程和Drell-Yan过程之间,夸克分布具有普遍性。另一方面,从$qq'\to qq'$通道贡献的双喷关联过程的夸克分布是不普遍的。然而,我们发现,它可以与DIS过程中的夸克分布通过卷积与归一化未积分胶子分布在大$N_c$极限的颜色玻璃凝聚体形式主义。

英文摘要:

We study the initial and final state interaction effects in the transverse momentum dependent parton distributions in the small-$x$ saturation region. In particular, we discuss the quark distributions in the semi-inclusive deep inelastic scattering, Drell-Yan lepton pair production and dijet-correlation processes in $pA$ collisions. We calculate the quark distributions in the scalar-QED model and then extend to the color glass condensate formalism in QCD. The quark distributions are found universal between the DIS and Drell-Yan processes. On the other hand, the quark distribution from the $qq'\to qq'$ channel contribution to the dijet-correlation process is not universal. However, we find that it can be related to the quark distribution in DIS process by a convolution with the normalized unintegrated gluon distribution in the color glass condensate formalism in the large $N_c$ limit.

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