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arXiv 0709.1368hep-ph
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DIS和pp碰撞中的衍射激发

Diffractive Excitation in DIS and pp Collisions

Emil Avsar, Gosta Gustafson, Leif Lonnblad

摘要:

我们在以前的论文中提出了Mueller偶极级联模型的一个扩展,它包括能量守恒和运行耦合的次引导效应以及通过"偶极摆动“从坡密子环产生的颜色抑制效应。应用该模型描述了pp和γ *p碰撞的总截面。在本文中,我们提出了一些改进的模型,特别是有关的约束机制。通过用屏蔽势代替无限程库仑势,进一步提高了模型的标架无关性,从而实现了偶极演化和偶极-偶极相互作用的一致处理。然后,我们将该模型应用于弹性散射和衍射激发,在那里我们专门研究了不同来源的波动的影响。在我们的形式主义,我们可以考虑到所有不同的来源,从偶极级联演化,偶极-偶极散射,从影响参数的依赖性,并从初始光子和质子波函数的贡献。从Tevatron和HERA的数据得到很好的协议,我们也提出了一些预测的大型强子对撞机。

英文摘要:

We have in earlier papers presented an extension of Mueller's dipole cascade model, which includes subleading effects from energy conservation and running coupling as well as colour suppressed effects from pomeron loops via a ``dipole swing''. The model was applied to describe the total cross sections in pp and gamma*p collisions. In this paper we present a number of improvements of the model, in particular related to the confinement mechanism. A consistent treatment of dipole evolution and dipole--dipole interactions is achieved by replacing the infinite range Coulomb potential by a screened potential, which further improves the frame-independence of the model. We then apply the model to elastic scattering and diffractive excitation, where we specifically study the effects of different sources for fluctuations. In our formalism we can take into account contributions from all different sources, from the dipole cascade evolution, the dipole--dipole scattering, from the impact-parameter dependence, and from the initial photon and proton wavefunctions. Good agreement is obtained with data from the Tevatron and from HERA, and we also present some predictions for the LHC.

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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