Color charge correlations in the proton at NLO: Beyond geometry based intuition
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.
- Publication Date:
- Research Org.:
- City Univ. of New York (CUNY), NY (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Nuclear Physics (NP)
- OSTI Identifier:
- 1811592
- Alternate Identifier(s):
- OSTI ID: 1850808; OSTI ID: 1855824
- Grant/Contract Number:
- SC0002307
- Resource Type:
- Published Article
- Journal Name:
- Physics Letters B
- Additional Journal Information:
- Journal Name: Physics Letters B Journal Volume: 820 Journal Issue: C; Journal ID: ISSN 0370-2693
- Publisher:
- Elsevier
- Country of Publication:
- Netherlands
- Language:
- English
- Subject:
- 72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; Astronomy & Astrophysics; Physics
Citation Formats
Dumitru, Adrian, Mäntysaari, Heikki, and Paatelainen, Risto. Color charge correlations in the proton at NLO: Beyond geometry based intuition. Netherlands: N. p., 2021.
Web. doi:10.1016/j.physletb.2021.136560.
Dumitru, Adrian, Mäntysaari, Heikki, & Paatelainen, Risto. Color charge correlations in the proton at NLO: Beyond geometry based intuition. Netherlands. https://doi.org/10.1016/j.physletb.2021.136560
Dumitru, Adrian, Mäntysaari, Heikki, and Paatelainen, Risto. Wed .
"Color charge correlations in the proton at NLO: Beyond geometry based intuition". Netherlands. https://doi.org/10.1016/j.physletb.2021.136560.
@article{osti_1811592,
title = {Color charge correlations in the proton at NLO: Beyond geometry based intuition},
author = {Dumitru, Adrian and Mäntysaari, Heikki and Paatelainen, Risto},
abstractNote = {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.},
doi = {10.1016/j.physletb.2021.136560},
journal = {Physics Letters B},
number = C,
volume = 820,
place = {Netherlands},
year = {Wed Sep 01 00:00:00 EDT 2021},
month = {Wed Sep 01 00:00:00 EDT 2021}
}
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