A1 Journal article (refereed)
Color charge correlations in the proton at NLO : beyond geometry based intuition (2021)

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

JYU authors or editors

Publication details

All authors or editors: Dumitru, Adrian; Mäntysaari, Heikki; Paatelainen, Risto

Journal or series: Physics Letters B

ISSN: 0370-2693

eISSN: 1873-2445

Publication year: 2021

Volume: 820

Article number: 136560

Publisher: Elsevier

Publication country: Netherlands

Publication language: English

DOI: https://doi.org/10.1016/j.physletb.2021.136560

Publication open access: Openly available

Publication channel open access: Open Access channel

Publication is parallel published (JYX): https://jyx.jyu.fi/handle/123456789/77304

Publication is parallel published: https://arxiv.org/abs/2103.11682

Abstract

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.

Keywords: protons

Free keywords: protons; color charge correlators

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Ministry reporting: Yes

Reporting Year: 2021

JUFO rating: 2