Nuclear geometry at high energy from exclusive vector meson production
Mäntysaari, H., Salazar, F., & Schenke, B. (2022). Nuclear geometry at high energy from exclusive vector meson production. Physical Review D, 106(7), Article 074019. https://doi.org/10.1103/PhysRevD.106.074019
Published inPhysical Review D
© Authors, 2022
We show that when saturation effects are included one obtains a good description of the exclusive J/ψ production spectra in ultraperipheral lead-lead collisions as recently measured by the ALICE Collaboration at the LHC. As exclusive spectra are sensitive to the spatial distribution of nuclear matter at small Bjorken-x, this implies that gluon saturation effects modify the impact parameter profile of the target as we move towards small x. In addition to saturation effects, we find a preference for larger nuclear strong-interaction radii compared to the typical charge radius. We demonstrate the role of finite photon transverse momentum and the interference between the cases for which the role of photon emitter and target are switched between the nuclei. We show that these effects are comparable to the experimental precision for pT-differential cross sections and as such need to be included when comparing to LHC data. Finally, the integrated J/ψ production cross sections from the LHC and preliminary transverse momentum spectra from RHIC are shown to prefer calculations with fluctuating nucleon substructure, although these datasets would require even stronger saturation effects than predicted from our framework. ...
PublisherAmerican Physical Society (APS)
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Related funder(s)European Commission; Academy of Finland
Funding program(s)Academy Research Fellow, AoF; Research costs of 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 fundingH. M. is supported by the Academy of Finland, the Centre of Excellence in Quark Matter, and Projects No. 338263 and No. 346567, and under the European Union’s Horizon 2020 research and innovation programme by the European Research Council (ERC, Grant Agreement No. ERC-2018-ADG-835105 YoctoLHC) and by the STRONG-2020 project (Grant Agreement No. 824093). 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. F. S. is supported by the National Science Foundation under Grant No. PHY-1945471, and partially supported by the UC Southern California Hub, with funding from the UC National Laboratories division of the University of California Office of the President. B. S. is supported by the U.S. Department of Energy, Office of Science, Office of Nuclear Physics under DOE Contract No. DE-SC0012704. Computing resources from CSC—IT Center for Science in Espoo, Finland and from the Finnish Grid and Cloud Infrastructure (persistent identifier urn:nbn:fi:research-infras-2016072533) were used in this work. ...
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