CGC and saturation approach: Impact-parameter dependent model of perturbative QCD and combined HERA data
Year: 2024
Type: article
Abstract: In this paper we confront the color glass condensate and saturation approach of Contreras [Non-linear equation in the re-summed next-to-leading order of perturbative QCD: The leading twist approximation, ] with the experimental combined HERA data and obtain its parameters. The model includes two features that are in accordance with our theoretical knowledge of deep inelastic scattering. These consist of: ( i ) the use of analytical solution for the nonlinear Balitsky-Kovchegov evolution equation and () the exponential behavior of the saturation momentum on the impact parameter b -dependence, characterized by Q s ∝ exp ( − m b ) which reproduces the correct behavior of the scattering amplitude at large b in accord with Froissart theorem. The model results are then compared to data at small- x for the structure function of the proton F 2 , the longitudinal structure function F L , the charm structure function F 2 c c ¯ , the exclusive vector meson ( J / ψ , ϕ , ρ ) production and deeply virtual Compton scattering. We obtain a good agreement for the processes in a wide kinematic range of Q 2 at small- x . Our results provide a strong guide for finding an approach, based on color glass condensate and saturation effective theory for high-energy QCD, to make reliable predictions from first principles and for forthcoming experiments like the Electron Ion Collider and the LHeC. Published by the American Physical Society 2024
Authors: Michael Roa, José Garrido, Miguel Guevara
Language: English
Subfield: Nuclear and High Energy Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: hybrid
OpenAlex ID: W4403187197