Signatures of gluon saturation from structure-function measurements
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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Physical Review DDate
2022Copyright
© Authors, 2022
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.
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American Physical Society (APS)ISSN Search the Publication Forum
2470-0010Keywords
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https://converis.jyu.fi/converis/portal/detail/Publication/150899510
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Research Council of Finland; European CommissionFunding 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; Centre of Excellence, 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 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. ...License
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