Color charge correlations in the proton at NLO : beyond geometry based intuition
Dumitru, A., Mäntysaari, H., & Paatelainen, R. (2021). Color charge correlations in the proton at NLO : beyond geometry based intuition. Physics Letters B, 820, Article 136560. https://doi.org/10.1016/j.physletb.2021.136560
Published inPhysics Letters B
© 2021 the Authors
Color charge correlators provide fundamental information about the proton structure. In this Letter, we evaluate numerically two-point color charge correlations in a proton on the light cone including the next-to-leading order corrections due to emission or exchange of a perturbative gluon. The non-perturbative valence quark structure of the proton is modelled in a way consistent with high-x proton structure data. Our results show that the correlator exhibits startlingly non-trivial behavior at large momentum transfer or central impact parameters, and that the color charge correlation depends not only on the impact parameter but also on the relative transverse momentum of the two gluon probes and their relative angle. Furthermore, from the two-point color charge correlator, we compute the dipole scattering amplitude. Its azimuthal dependence differs significantly from a impact parameter dependent McLerran-Venugopalan model based on geometry. Our results also provide initial conditions for Balitsky-Kovchegov evolution of the dipole scattering amplitude. These initial conditions depend not only on the impact parameter and dipole size vectors, but also on their relative angle and on the light-cone momentum fraction x in the target. ...
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Related funder(s)European Commission; Academy of Finland
Funding program(s)Postdoctoral Researcher, AoF
The content of the publication reflects only the author’s view. The funder is not responsible for any use that may be made of the information it contains.
Additional information about fundingThis work was supported by the Academy of Finland, projects 314764 (H.M) and 1322507 (R.P). H.M. is supported under the European Union's Horizon 2020 research and innovation programme STRONG-2020 project (grant agreement no. 824093), and R.P. by the European Research Council grant agreement no. 725369. A.D. thanks the U.S. Department of Energy, Office of Nuclear Physics, for support via Grant DE-SC0002307. ...
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