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


Escobedo, Miguel A.; Lappi, Tuomas (2020). The dipole picture and the non-relativistic expansion. In Light Cone 2019 : QCD on the light cone : from hadrons to heavy ions (POS Proceedings of Science, 374. Sissa, 039. DOI: 10.22323/1.374.0039


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Publication details

All authors or editors: Escobedo, Miguel A.; Lappi, Tuomas

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

Conference:

  • Light Cone Conference

Place and date of conference: Palaiseau, France, 16.-20.9.2019

Journal or series: POS Proceedings of Science

eISSN: 1824-8039

Publication year: 2020

Number in series: 374

Article number: 039

Publisher: Sissa

Publication country: Italy

Publication language: English

DOI: https://doi.org/10.22323/1.374.0039

Open Access: Publication published in an open access channel

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


Abstract

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.


Keywords: particle physics


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Last updated on 2021-14-01 at 15:02