Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2007-12-17
Phys.Rev.D78:014016,2008
Physics
High Energy Physics
High Energy Physics - Phenomenology
19 pages, 16 figures. Revised version published in Phys. Rev. D; new section added on longitudinal and heavy flavour structure
Scientific paper
10.1103/PhysRevD.78.014016
We show that the colour glass condensate dipole model of Iancu, Itakura and Munier, improved to include the impact parameter dependence, gives a good fit to the total gamma* p cross section measured at HERA if the anomalous dimension at the saturation scale, gamma_s, is treated as a free parameter. We find that the optimum value of gamma_s = 0.46 is close to the value determined from numerical solution of the Balitsky-Kovchegov equation. The impact parameter dependent saturation scale is generally less than 0.5 GeV^2 in the HERA kinematic regime for the most relevant impact parameters b ~ 2-3 GeV^{-1}. We compare predictions of the model to data on the longitudinal and heavy flavour structure functions, exclusive diffractive vector meson production and deeply virtual Compton scattering at HERA. The model is found to be deficient for observables sensitive to moderately small dipole sizes, where an alternative model with explicit DGLAP evolution performs better. The energy dependence of exclusive diffractive processes is shown to provide an important discriminator between different dipole model cross sections.
Kowalski Henri
Watt George
No associations
LandOfFree
Impact parameter dependent colour glass condensate dipole model does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Impact parameter dependent colour glass condensate dipole model, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Impact parameter dependent colour glass condensate dipole model will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-548574