A1 Journal article (refereed)
Dipole picture and the nonrelativistic expansion (2020)

Escobedo, M. À., & Lappi, T. (2020). Dipole picture and the nonrelativistic expansion. Physical Review D, 101(3), Article 034030. https://doi.org/10.1103/PhysRevD.101.034030

JYU authors or editors

Publication details

All authors or editors: Escobedo, Miguel Àngel; Lappi, Tuomas

Journal or series: Physical Review D

ISSN: 2470-0010

eISSN: 2470-0029

Publication year: 2020

Volume: 101

Issue number: 3

Article number: 034030

Publisher: American Physical Society

Publication country: United States

Publication language: English

DOI: https://doi.org/10.1103/PhysRevD.101.034030

Publication open access: Openly available

Publication channel open access: Partially open access channel

Publication is parallel published (JYX): https://jyx.jyu.fi/handle/123456789/68020

Web address of parallel published publication (pre-print): https://arxiv.org/abs/1911.01136


We study exclusive quarkonium production in the dipole picture at next-to-leading-order (NLO) accuracy, using the nonrelativistic expansion for the quarkonium wave function. 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 nonrelativistic 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 nonrelativistic expansion is consistent with Efremov-Radyushkin-Brodsky-Lepage evolution and with Balitsky-Jalilian-Marian-Iancu-McLerran-Weigert-Leonidov-Kovner 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.

Keywords: nuclear physics

Free keywords: electron-ion collisions; relativistic heavy-ion collions

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Ministry reporting: Yes

Reporting Year: 2020

JUFO rating: 2

Last updated on 2022-20-09 at 13:50