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Electron Ion Collider: The Next QCD Frontier - Understanding the glue that binds us all

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arxiv 1212.1701 v3 pith:5DVB6SJB submitted 2012-12-07 nucl-ex hep-exhep-phnucl-th

classification nucl-exhep-exhep-phnucl-th
keywords scienceacceleratorcolliderjlabnuclearfocusedfrontiernational
verification ladder T0 review T1 audit T2 compute T3 formal
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This White Paper presents the science case of an Electron-Ion Collider (EIC), focused on the structure and interactions of gluon-dominated matter, with the intent to articulate it to the broader nuclear science community. It was commissioned by the managements of Brookhaven National Laboratory (BNL) and Thomas Jefferson National Accelerator Facility (JLab) with the objective of presenting a summary of scientific opportunities and goals of the EIC as a follow-up to the 2007 NSAC Long Range plan. This document is a culmination of a community-wide effort in nuclear science following a series of workshops on EIC physics and, in particular, the focused ten-week program on "Gluons and quark sea at high energies" at the Institute for Nuclear Theory in Fall 2010. It contains a brief description of a few golden physics measurements along with accelerator and detector concepts required to achieve them, and it benefited from inputs from the users' communities of BNL and JLab. This White Paper offers the promise to propel the QCD science program in the U.S., established with the CEBAF accelerator at JLab and the RHIC collider at BNL, to the next QCD frontier.

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    Single inclusive high-PT hadron and jet production in lepton-hadron scattering is factorized using a joint QCD+QED approach with universal lepton distribution functions, and predictions are given for JLab and EIC energies.

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    Only the C-even twist-3 gluon distribution contributes to the J/psi single transverse-spin asymmetry, providing a probe of gluon TMDs with sizable predicted effects at collider energies.

  7. Extraction of the color dipole amplitude with physics-informed neural networks

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    Physics-informed neural networks extract a model-independent color dipole amplitude from inclusive HERA data that predicts exclusive J/ψ photoproduction cross-sections without parameter retuning.

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    A single shockwave Feynman-rule framework reproduces and extends prior small-x parton distributions, yielding new quark GTMD/GPD/PDF and diffractive-TMD results.

  11. Accessing nucleon transversity with one-point energy correlators

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  17. Spin and momentum fraction carried by partons in the nucleon

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  19. Radiative corrections in neutral-current (anti)neutrino elastic scattering at $\text{GeV}$ energies I: Nucleon targets

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    Radiative corrections to neutral-current (anti)neutrino-nucleon elastic scattering are computed within low-energy EFT and reach a few percent, comparable to the strange-quark effects they must be disentangled from.

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  46. Polarized Deep-Inelastic Scattering with Spin Correlations in Herwig 7

    hep-ph 2026-06 unverdicted novelty 5.0 of 10

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  47. Diffractive Production of Heavy Quarkonia at the Electron Ion Collider

    hep-ph 2026-06 unverdicted novelty 5.0 of 10

    Keeping the full gluon transverse momentum in diffractive quarkonium production matches HERA psi(2S)/J/psi ratios better than the standard dipole limit and yields new EIC Upsilon-ratio predictions.

  48. Constraining DVCS Compton Form Factors Using Lattice QCD informed Neural Network

    hep-ph 2026-06 unverdicted novelty 5.0 of 10

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  49. Maximum phase-space density of linearly polarized gluon TMDs in the saturation region

    hep-ph 2026-05 unverdicted novelty 5.0 of 10

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  50. Multiplicity distributions in DIS for heavy nucleus

    hep-ph 2026-05 unverdicted novelty 5.0 of 10

    Homotopy solutions to BFKL Pomeron evolution equations in nuclear DIS produce multiplicity distributions of produced gluons.

  51. Gravitational form factors of light mesons from Basis Light-Front Quantization

    hep-ph 2026-05 unverdicted novelty 5.0 of 10

    Gravitational form factors of pion and kaon are computed in BLFQ; A(Q^2) agrees with lattice QCD while D(Q^2) is enhanced at low Q^2 due to small-x and zero-mode sensitivity in the truncated model.

  52. Resolved photoproduction of the $B_c$ meson in electron-proton collisions

    hep-ph 2026-02 unverdicted novelty 5.0 of 10

    Direct gamma-gluon fusion dominates B_c photoproduction in ep collisions, with resolved gluon-gluon contributing O(10%) at low p_T across HERA to EIC energies.

  53. ALP and $Z^\prime$ boson at the Electron-Ion collider

    hep-ph 2026-01 conditional novelty 5.0 of 10

    Projected EIC tri-electron searches would constrain electron-coupled ALPs and Z' bosons more strongly than current experiments at masses of about 10-100 GeV and 10-30 GeV, respectively.

  54. Flavor physics at the EIC with b-jet tagging

    hep-ph 2026-01 conditional novelty 5.0 of 10

    Single b-jet counting in charged-current events at the EIC could probe new flavor-changing physics up to Λ_eff ≈ 5 TeV, about 30 times the collider energy, assuming tight b-tagging and polarized beams.

  55. QCD Wehrl and entanglement entropies in a gluon spectator model at small-$x$

    hep-ph 2025-12 unverdicted novelty 5.0 of 10

    In a gluon spectator model at small x, the normalized Husimi distribution yields a Wehrl entropy that decomposes into an entanglement entropy term matching CMS data and a transverse residual term.

  56. Assessing the impact of the electron ion collider in China on Deeply Virtual Compton Scattering

    hep-ph 2025-12 conditional novelty 5.0 of 10

    Projected EicC DVCS asymmetry data would substantially reduce uncertainties on all leading-order Compton form factors, most strongly in the sea-quark region.

  57. Letter of Intent: The Forward Physics Facility

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  58. Probing nuclear structure with the Balitsky-Kovchegov equation in full impact-parameter dependence

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  59. Probing Scalar-Mediator Quark Couplings via CLFV Lepton-Nucleon Scattering

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  60. Eliminating beam-induced depolarizing effects in the hydrogen jet target for high-precision proton beam polarimetry at the Electron-Ion Collider

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    A frequency-domain analysis of EIC beam harmonics shows that a 400 mT guide field is needed to keep the hydrogen jet target from depolarizing.

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