Signatures of gluon saturation from structure-function measurements
Abstract
We study experimentally observable signals for nonlinear QCD dynamics in deep inelastic scattering (DIS) at small Bjorken variable x and moderate virtuality Q2, by quantifying differences between the linear Dokshitzer-Gribov-Lipatov-Altarelli-Parisi evolution and nonlinear evolution with the Balitsky-Kovchegov equation. To remove the effect of the parametrization freedom in the initial conditions of both equations, we first match the predictions for the DIS structure functions F2 and FL from both frameworks in a region in x, Q2 where both frameworks should provide an accurate description of the relevant physics. The differences in the dynamics are then quantified by the deviations when one moves away from this matching region. For free protons we find that the differences in F2 remain at a few-percent level, while in FL the deviations are larger, up to 10% at the Electron Ion Collider (EIC) and 40% at the Large Hadron-electron Collider (LHeC) kinematics. With a heavy nucleus the differences are up to 10% in F2, and can reach 20% and 60% in FL for the EIC and the LHeC, respectively.
Main Authors
Format
Articles
Research article
Published
2022
Series
Subjects
Publication in research information system
Publisher
American Physical Society (APS)
The permanent address of the publication
https://urn.fi/URN:NBN:fi:jyu-202208164128Use this for linking
Review status
Peer reviewed
ISSN
2470-0010
DOI
https://doi.org/10.1103/PhysRevD.105.114017
Language
English
Published in
Physical Review D
Citation
- Armesto, N., Lappi, T., Mäntysaari, H., Paukkunen, H., & Tevio, M. (2022). Signatures of gluon saturation from structure-function measurements. Physical Review D, 105(11), Article 114017. https://doi.org/10.1103/PhysRevD.105.114017
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Funder(s)
Research Council of Finland
European Commission
Research Council of Finland
Research Council of Finland
European Commission
Research Council of Finland
Research Council of Finland
Funding program(s)
Research costs of Academy Research Fellow, AoF
ERC Advanced Grant
Academy Project, AoF
Academy Research Fellow, AoF
RIA Research and Innovation Action, H2020
Academy Research Fellow, AoF
Centre of Excellence, AoF
Akatemiatutkijan tutkimuskulut, SA
ERC Advanced Grant
Akatemiahanke, SA
Akatemiatutkija, SA
RIA Research and Innovation Action, H2020
Akatemiatutkija, SA
Huippuyksikkörahoitus, SA
Funded by the European Union. Views and opinions expressed are however those of the author(s) only and do not necessarily reflect those of the European Union or the European Education and Culture Executive Agency (EACEA). Neither the European Union nor EACEA can be held responsible for them.
Additional information about funding
This work was supported by the Academy of Finland, the Centre of Excellence in Quark Matter (Project No. 346324), and Projects No. 321840, No. 338263, No. 346567, and No. 308301. This work was also supported by the European Union’s Horizon 2020 research and innovation program under Grant Agreement No. 824093 and the European Research Council under Project No. ERC-2018-ADG-835105 YoctoLHC. N. A. acknowledges financial support by Xunta de Galicia (Centro singular de investigación de Galicia accreditation 2019–2022); the “María de Maeztu” Units of Excellence Program No. MDM2016-0692 and the Spanish Research State Agency under Project No. FPA2017-83814-P; European Union European Regional Development Fund (ERDF); and Marie Skłodowska-Curie Research and Innovation Staff Exchange (MSCA RISE) 823947 “Heavy ion collisions: collectivity and precision in saturation physics” (HIEIC); and the Spanish Research State Agency (Agencia Estatal de Investigación). The content of this article does not reflect the official opinion of the European Union and responsibility for the information and views expressed therein lies entirely with the authors.
Copyright© Authors, 2022