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Gluons and the quark sea at high energies: distributions, polarization, tomography
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This report is based on a ten-week program on "Gluons and the quark sea at high-energies", which took place at the Institute for Nuclear Theory in Seattle in Fall 2010. The principal aim of the program was to develop and sharpen the science case for an Electron-Ion Collider (EIC), a facility that will be able to collide electrons and positrons with polarized protons and with light to heavy nuclei at high energies, offering unprecedented possibilities for in-depth studies of quantum chromodynamics. This report is organized around four major themes: i) the spin and flavor structure of the proton, ii) three-dimensional structure of nucleons and nuclei in momentum and configuration space, iii) QCD matter in nuclei, and iv) Electroweak physics and the search for physics beyond the Standard Model. Beginning with an executive summary, the report contains tables of key measurements, chapter overviews for each of the major scientific themes, and detailed individual contributions on various aspects of the scientific opportunities presented by an EIC.
Forward citations
Cited by 11 Pith papers
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Emergent Local Phase-Space Scaling in Small-x Gluon Evolution
In the fixed-coupling SO(3)-BK model, Q_s-adaptive coarse graining of the gluon Husimi distribution produces collapse of conditional momentum distributions onto k/Q_s and unit-slope growth of conditional entropy with ...
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Unpolarized GPDs at small $x$ and non-zero skewness
Unpolarized GPDs and GTMDs at small x with non-zero skewness are expressed via the dipole amplitude N and odderon O with modified rapidity Y = ln min{1/|x|, 1/|ξ|}.
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Probing the neutron-skin thickness through $J/\psi$ photoproduction in ultra-peripheral collisions
Larger neutron skin produces a smoother nuclear color-density profile that suppresses coherent J/ψ photoproduction at large |t| while enhancing incoherent production, making the incoherent-to-coherent cross-section ra...
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Accessing gluon GTMD $F^g_{1,4}$ via the $\langle\sin(2\phi)\rangle$ azimuthal asymmetry of exclusive $\pi^0$ production in $ep$ collisions
A light-front spectator model yields the first calculation of Im(F^g_{1,4}) and the resulting sin(2φ) asymmetry in ep → epπ⁰ at EIC kinematics.
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Maximum phase-space density of linearly polarized gluon TMDs in the saturation region
Computes maximum phase-space density of linearly polarized gluon TMD h1^⊥g as ~2 α_s^{-3/2} (dipole) in saturation using Mueller occupancy and prior WW/dipole distributions, with numerical Collins-Soper study.
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Probing Saturation Effect in Heavy Meson Pair Correlation in Forward $pA$ Collisions
Heavy meson pair correlations in forward pA collisions are computed in the CGC framework with Sudakov resummation, reproducing LHCb data and showing a mass hierarchy in R_pA that strengthens at higher rapidity.
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Effect of sub-nucleon fluctuations on the DVCS process in proton and nuclear targets at the EIC
Hot-spot sub-nucleon fluctuations produce a turnover in the energy dependence of incoherent DVCS cross sections, raise the coherent-to-incoherent ratio with energy and atomic number, and create a maximum in the nuclea...
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On the Two $R$-Factors in the Small-$x$ Shockwave Formalism
Replacing the rapidity argument of the dipole amplitude with ln min{1/|x|, 1/|ξ|} and refining initial conditions for non-linear evolution can eliminate two R-factors in small-x shockwave calculations.
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Probing quark transversity GPDs in diffractive photo- and electroproduction on the deuteron
Calculations for coherent vector meson production on deuteron indicate that an EIC could probe transversity GPDs.
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Opportunities for spin physics at EIC
An overview paper summarizing opportunities to measure electroweak polarized structure functions, PDFs, TMDs, GPDs, GTMDs, and related spin effects at the EIC, noting its essential role for small-x and high-Q2 studies.
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Precision QCD with the Electron-Ion Collider
A workshop summary report outlines discussion topics in perturbative QCD, nuclear structure, and related techniques for the upcoming Electron-Ion Collider.
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