A4 Article in conference proceedings
The dipole picture and the non-relativistic expansion (2020)

Escobedo, M. A., & Lappi, T. (2020). The dipole picture and the non-relativistic expansion. In Light Cone 2019 : QCD on the light cone : from hadrons to heavy ions (Article 039). Sissa. POS Proceedings of Science, 374. https://doi.org/10.22323/1.374.0039

JYU authors or editors

Publication details

All authors or editorsEscobedo, Miguel A.; Lappi, Tuomas

Parent publicationLight Cone 2019 : QCD on the light cone : from hadrons to heavy ions


  • Light Cone Conference

Place and date of conferencePalaiseau, France16.-20.9.2019

Journal or seriesPOS Proceedings of Science


Publication year2020

Number in series374

Article number039


Publication countryItaly

Publication languageEnglish


Publication open accessOpenly available

Publication channel open accessOpen Access channel

Publication is parallel published (JYX)https://jyx.jyu.fi/handle/123456789/73613


We study exclusive quarkonium production in the dipole picture at next-to-leading order (NLO) accuracy, using the non-relativistic expansion for the quarkonium wavefunction. This process offers one of the best ways to obtain information about gluon distributions at small x, in ultraperipheral heavy ion collisions and in deep inelastic scattering. The quarkonium light cone wave functions needed in the dipole picture have typically been available only at tree level, either in phenomenological models or in the nonrelativistic limit. In this paper, we discuss the compatibility of the dipole approach and the non-relativistic expansion and compute NLO relativistic corrections to the quarkonium light-cone wave function in light-cone gauge. Using these corrections we recover results for the NLO decay width of quarkonium to e+e− and we check that the non-relativistic expansion is consistent with ERBL evolution and with B-JIMWLK evolution of the target. The results presented here will allow computing the exclusive quarkonium production rate at NLO once the one loop photon wave function with massive quarks, currently under investigation, is known.

Keywordsparticle physics

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Ministry reportingYes

Reporting Year2020

JUFO rating0

Last updated on 2024-22-04 at 11:42