Dipole picture and the nonrelativistic expansion
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
Published inPhysical Review D
© The Authors, 2020
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. ...
PublisherAmerican Physical Society
Publication in research information system
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Related funder(s)Academy of Finland; European Commission
Funding program(s)Academy Project, AoF; Research costs of Academy Research Fellow, AoF; Research post as Academy Research Fellow, AoF
The content of the publication reflects only the author’s view. The funder is not responsible for any use that may be made of the information it contains.
Additional information about fundingThis work has been supported by theAcademy of Finland, Projects No. 267321, No. 303756,and No. 321840 and by the European Research Council(ERC) under the European Union’s Horizon 2020 researchand innovation programme (Grant No. ERC-2015-CoG-681707). The work of M. A. E. was supported by theAcademy of Finland Project No. 297058, byMinisterio deCiencia e Innovacionof Spain under Project No. FPA2017-83814-P and Maria de Maetzu Unit of Excellence MDM-2016-0692, by Xunta de Galicia and FEDER. ...
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