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Future Opportunities at an Electron-Ion Collider

Future Opportunities at an Electron-Ion Collider. Oleg Eyser Brookhaven National Laboratory. Exploring the Glue that Binds U s A ll. Questions at the next QCD frontier How are the sea quarks and gluons, and their spins, distributed in space and momentum inside the nucleon?

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Future Opportunities at an Electron-Ion Collider

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  1. Future Opportunitiesat anElectron-Ion Collider Oleg Eyser Brookhaven National Laboratory

  2. Exploring the Glue that Binds Us All • Questions at the next QCD frontier • How are the sea quarks and gluons, and their spins, distributed in space and momentum inside the nucleon? • Where does the saturation of gluon densities set in? • How does the nuclear environment affect the distribution of quarks and gluons and their interactions in nuclei? • An Electron-Ion Collider • Electron beams for precision measurements • Polarized nucleon beams • Heavy ion beams of different species • Kinematic reach into the gluon dominated regime • Dedicated hermetic detector setup

  3. The Structure of the Nucleon • What is the dynamical origin of sea quarks and gluons inside the proton? • How does the proton spin originate at the microscopic level? • How is hadron structure influenced by chiral symmetry and its breaking? • How does confinement manifest itself in the structure of hadrons?

  4. Partonic Descriptions of the Nucleon

  5. Deep Inelastic Scattering Lorentz invariants In the collider frame Other variables

  6. Structure Functions

  7. Longitudinal Spin Structure

  8. Longitudinal Spin Structure

  9. Quark TMD Distributions in SIDIS

  10. Quark TMD Distributions

  11. Spatial Imaging of Nucleons Fourier transform of at Exclusive processes Resolution scale

  12. Deeply Virtual Compton Scattering

  13. Towards Spatial Imaging Combine with next slide???

  14. Gluon Distributions

  15. The Nucleus: A Laboratory for QCD • What is the role of strong gluon fields, parton saturation effects, and collective gluon excitations in nuclei? • Can we experimentally find evidence of non-linear QCD dynamics in the high-energy scattering off nuclei? • What are the momentum/spatial distributions of gluons and sea quarks in nuclei? • Are there strong color fluctuations inside a large nucleus?

  16. High Gluon Densities in Nuclei

  17. Lepton-Nucleus Scattering u.r. boost amplifies the gluon densities in nucleus ()

  18. Nuclear PDFs Expect strong non-linear effects in FL from higher twist contributions Dipole model from Bartels et al. Quantify by

  19. Nuclear PDFs

  20. Di-hadron Correlations Prediction in CGC framework Expected experimental significance GeV with EPS09 (nPDF shadowing) PYTHIA6 (partons, showers, fragmentation) DPMJet-III (nuclear geometry) PRD 83, 1 5005 (2011) PRL 106, 022301 (2011)

  21. Diffractive Scattering Rapidity gap Black disc limit Non-linear amplify in e+A

  22. Exclusive Vector Meson Production Fix momentum transfer

  23. Spatial Gluon Distribution

  24. Precision Measurement of

  25. ERL eRHIC Electron beam energy 10 GeV Proton beam energy 250 GeV Ion beam energy 100 GeV/A Electron beam polarization 80% Proton beam polarization 70%

  26. MEIC Electron beam energy 5 GeV Proton beam energy 60 GeV Ion beam energy 40 GeV/A Electron beam polarization 80% Proton beam polarization 70%

  27. DIS Kinematics Scattered electron 5 GeV x 50 GeV 10 GeV x 100 GeV 20 GeV x 250 GeV

  28. SIDIS Kinematics Non-exclusive pion

  29. DVCS Kinematics 5 GeV x 100 GeV10 GeV x 100 GeV 20 GeV x 100 GeV Photon in lab. frame

  30. Detector Layout Solenoid EM-Calorimeter Dual Rad. RICH Aero RICH/DIRC/HR-ToF Tracking Micro-Vertex Tracking

  31. arXiv:1212.1701 http://www.bnl.gov/npp/docs/EIC_White_Paper_Final.pdf

  32. Longitudinal Spin Structure

  33. Transverse Momentum Dependence

  34. Spatial Imaging DVCS

  35. Saturation Scale QS The ultra-relativistic boost amplifies the gluon densities in a nucleus

  36. Diffractive Cross Section

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