CGC/saturation approach: A new impact-parameter dependent model
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- 作者：Carlos Contrerasa ; carlos.contreras@usm.cl" class="auth_mail" title="E-mail the corresponding author ; Eugene Levina ; b ; eugeny.levin@usm.cl" class="auth_mail" title="E-mail the corresponding author ; leving@post.tau.ac.il" class="auth_mail" title="E-mail the corresponding author ; Irina Potashnikovaa ; irina.potashnikova@usm.cl" class="auth_mail" title="E-mail the corresponding author
- 关键词：CGC/saturation approach ; Impact parameter dependence of the scattering amplitude ; Solution to non-linear equation ; Deep inelastic structure function ; Diffraction at high energies
- 刊名：Nuclear Physics A
- 出版年：2016
- 出版时间：April 2016
- 年：2016
- 卷：948
- 期：Complete
- 页码：1-18
- 全文大小：640 K
文摘
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 
dependence, has been taken into account; and the large impact parameter dependence, through the b-dependence of the saturation momentum which reproduce the correct behavior of the amplitude at large impact parameters b (A∝exp(−μb)) as well as at large momentum transferred QT (A decreases as a power of QT as it follows from perturbative QCD). These improvements compared to all previous attempts to build such models allow 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.
dependence, has been taken into account; and the large impact parameter dependence, through the b-dependence of the saturation momentum which reproduce the correct behavior of the amplitude at large impact parameters b (A∝exp(−μb)) as well as at large momentum transferred QT (A decreases as a power of QT as it follows from perturbative QCD). These improvements compared to all previous attempts to build such models allow 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.