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Finite-size effects on small- x evolution and saturation in proton and nuclear targets

Year: 2025
Type: article
Abstract: Within the color glass condensate effective field theory, we assess the importance of including a finite size for the target on observables sensitive to small- x evolution. To this end, we study the Balitsky-Kovchegov (BK) equation with impact-parameter dependence in the initial condition. We demonstrate that neglecting the dependence on the impact parameter can result in overestimated saturation effects for protons, while it has little effect for heavy nuclei at the energies available at current experiments. When fixing the nonperturbative parameters to the energy dependence of the exclusive J / ψ photoproduction cross section with proton targets, predictions for lead targets are not sensitive to the applied running-coupling prescription, the scheme chosen to resum large transverse logarithms in the BK equation, or the infrared regulator in the evolution.
DOI: 10.1103/physrevd.111.054033
Institutions: University of Helsinki, Helsinki Institute of Physics, University of Jyväskylä, University of California, Los Angeles, University of Washington, Brookhaven National Laboratory
Language: English
Open Access status: hybrid
Funders: National Science Foundation, U.S. Department of Energy, European Commission, Academy of Finland, China Scholarship Council, Office of Science, European Research Council, Nuclear Physics
Awards: G1073255417, G111697547, G1132151304, INSTITUTE FOR NUCLEAR THEORY, G1607047924, G222768804, G241279073, INSTITUTE FOR NUCLEAR THEORY, G3019630846, G357145406, G4609402250, G5765906131, G6753714465, INSTITUTE FOR NUCLEAR THEORY, G7463374569, CAREER: Hadron's Transverse Structure and Associated QCD Dynamics, G7567520714, QCD Matter in Extreme Conditions, G872144517
OpenAlex ID: W4409013443
FWCI: 7.574
Cites: 81
Cited by: 16
Related to: 10