arXivDaily arXiv每日学术速递 周一至周五更新
北美退伍军人节(Veterans Day),12 日无更新
arXiv 1508.02544hep-ph
收藏

CGC/饱和方法:一个新的碰撞参量相关模型

CGC/saturation approach: a new impact-parameter dependent model

Carlos Contreras, Eugene Levin, Irina Potashnikova

摘要:

{In本文提出了一个新的碰撞参量依赖的CGC/饱和模型。我们在模型中引入了两个新的功能,使它与我们所知道的理论上的深部非弹性散射相一致。它们是:- 使用非线性(BK)方程的解的精确形式,而在所有以前的尝试中仅考虑了$r^2Q^2_s$依赖性的形式;以及大的碰撞参量依赖性,通过饱和动量的$b$依赖性,再现了在大碰撞参量$b$下振幅的正确行为($A \propto \exp\Lb - μb\Rb$)以及在大动量转移$Q_T$($A $作为$Q_T$的幂减少,因为它遵循微扰QCD)。这些改进相比,所有以前的尝试,建立这样的模型,使我们能够声称,实验数据是符合预测的CGC/饱和的方法,而以前,基于类似的模型,我们只能得出结论,DIS数据,也许,可以通过引入阴影修正在小光子虚拟。

英文摘要:

{In this paper we propose a new impact-parameter dependent CGC/saturation model. We introduce two new features in the model that make it consistent with what we know theoretically about the deep inelastic scattering. They are: the use of the exact form of the solution to the non-linear (BK) equation, whereas in all previous attempts only the form of $r^2Q^2_s$ dependence, has been taken into account; and the large impact parameter dependence, through the $b$-dependence of the saturation momentum which reproduce the correct behaviour of the amplitude at large impact parameters $b$ ($A \propto \exp\Lb - μb\Rb$) as well as at large momentum transferred $Q_T$ ($A $ decreases as a power of $Q_T$ as it follows from perturbative QCD). These improvement compared to all previous attempts to build such models, allows us to claim, that the experimental data are in accord with the prediction of CGC/saturation approach while previously, based on similar models, we could only conclude that the DIS data, perhaps, can be described by introducing the shadowing corrections at small photon virtualities.

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。

↑