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Finite-size effects on small-x evolution and saturation in proton and nuclear targets
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Finite-size effects on small-x evolution and saturation in proton and nuclear targets
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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 $J/\psi$ 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.
Forward citations
Cited by 6 Pith papers
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Sub-eikonal stress and model dependence of the small-$x$ gluon D-term
The gluon D-term at small x is a next-to-eikonal stress observable whose sign is not determined by the dipole or saturation profile.
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Sub-eikonal stress and model dependence of the small-$x$ gluon D-term
The small-x gluon D-term is a next-to-eikonal stress probe and is not fixed by the leading-eikonal dipole or saturation profile alone.
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Confronting Color Glass Condensate at next-to-leading order with HERA data
A Bayesian global fit at full NLO+NLL accuracy extracts the posterior distribution for the non-perturbative initial condition of the NLO Balitsky-Kovchegov equation from HERA inclusive and charm data.
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Physics-Informed Global Extraction of the Universal Small-$x$ Dipole Amplitude
A nonparametric PINN-constrained dipole amplitude simultaneously describes HERA total/charm DIS and J/psi photoproduction while maintaining Fourier positivity, unlike analytic MV-type fits.
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Revisiting the role of saturation in diffractive vector meson production
EMD-corrected LHC data enables a consistent CGC description of coherent and incoherent diffractive J/ψ production in γ+p and γ+Pb via Bayesian inference from combined HERA and LHC measurements.
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Nuclear structure and saturation effects from diffractive vector meson production
Predictions for vector meson production in light-nucleus UPCs show t-differential observables sensitive to nuclear structure models and saturation suppression that grows with nuclear mass and collision energy.
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