Confronting the impact parameter dependent JIMWLK evolution with HERA data
Mäntysaari, H., & Schenke, B. (2018). Confronting the impact parameter dependent JIMWLK evolution with HERA data. Physical Review D, 98(3), Article 034013. https://doi.org/10.1103/PhysRevD.98.034013
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Physical Review DDate
2018Copyright
© Authors, 2018. Published by the American Physical Society. Funded by SCOAP3.
The small-x evolution of protons is determined from numerical solutions of the JIMWLK equations,
starting from an initial condition at moderate x for a finite size proton. The resulting dipole amplitude is
used to calculate the total reduced cross section σr and charm reduced cross section σrc, as well as
diffractive vector meson production. We compare results to experimental data from HERA and discuss
fundamental problems arising from the regime sensitive to nonperturbative physics. We emphasize that
information on the gluonic content of the proton, gluon spatial distributions and correlations over wide
ranges in x, which can in principle be constrained by our study, are essential ingredients for describing the
initial state in proton-proton and proton-ion collisions. Future electron nucleus collisions at an electron-ion
collider will provide important additional insight for heavier nuclei. We further demonstrate that it is not
possible to rigorously probe the saturation regime of the color glass condensate framework in electronproton
collisions at HERA energies and that electron-heavy ion collisions will be essential to access its
regime of validity.
...
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American Physical SocietyISSN Search the Publication Forum
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European CommissionFunding program(s)
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 under DOE Contract No. DE-SC0012704. H. M. is supported by European Research Council, Grant No. ERC-2015-CoG-681707. B. P. S. acknowledges a DOE Office of Science Early Career Award.License
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