Accessing the gluonic structure of light nuclei at a future electron-ion collider - INSPIRE

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Accessing the gluonic structure of light nuclei at a future electron-ion collider

Heikki Mäntysaari
(
- Jyvaskyla U. and
- Helsinki U.
)
,
Björn Schenke
(
- Brookhaven
)

Oct 8, 2019

12 pages

Published in:

Phys.Rev.C 101 (2020) 1, 015203

Published: Jan 14, 2020

e-Print:

1910.03297 [hep-ph]

DOI:

10.1103/PhysRevC.101.015203

View in:

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Abstract: (APS)

We show how exclusive vector meson production off light ions can be used to probe the spatial distribution of small-x gluons in the deuteron and He3 wave functions. In particular, we demonstrate how short-range repulsive nucleon-nucleon interactions affect the predicted coherent J/Ψ production spectra. Fluctuations of the nucleon substructure are shown to have a significant effect on the incoherent cross section above |t|≳0.2GeV2. By explicitly performing the Jalilian-Marian–Iancu–McLerran–Weigert–Leonidov–Kovner (JIMWLK) evolution, we predict the x dependence of coherent and incoherent cross sections in the electron-ion collider energy range. In addition to the increase of the average size of the nucleus with decreasing x, both the growth of the nucleons and subnucleonic hot spots are visible in the cross sections. The decreasing length scale of color charge fluctuations with decreasing x is also present, but may not be observable for |t|<1GeV2, if subnucleonic spatial fluctuations are present.

Note:

13 pages, 15 figures. v2: typos corrected

24.85.+p
13.60.-r
Hadronic Physics and QCD
nucleon: fluctuation
color
model: dipole
nucleon nucleon: interaction
vector meson: production
electron nucleon: colliding beams
coherence

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Figures(15)

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