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POETIC 2012 Indiana University

From JLab12 to EIC. 12 GeV CEBAF. R. D. McKeown. POETIC 2012 Indiana University. d 3 r. TMD PDFs f 1 u (x,k T ), .. h 1 u (x,k T ) ‏. Unified View of Nucleon Structure. 6D Dist. W p u (x,k T , r ) Wigner distributions. d 2 k T dr z. GPDs/IPDs. 3D imaging. dx &

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POETIC 2012 Indiana University

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  1. From JLab12 to EIC 12 GeV CEBAF R. D. McKeown POETIC 2012 Indiana University

  2. d3r TMD PDFs f1u(x,kT), .. h1u(x,kT)‏ Unified View of Nucleon Structure 6D Dist. Wpu(x,kT,r ) Wigner distributions d2kT drz GPDs/IPDs 3D imaging dx & Fourier Transformation d2kT d2rT Form Factors GE(Q2), GM(Q2)‏ PDFs f1u(x), .. h1u(x)‏ 1D

  3. Extraction of GPD’s Ds 2s s+ - s- s+ + s- A = = Cleanest process: Deeply Virtual Compton Scattering ξ=xB/(2-xB) hard vertices Polarized beam, unpolarized target: H(x,t) ~ DsLU~ sinf{F1H+ ξ(F1+F2)H+kF2E}df t Unpolarized beam, longitudinal target: ~ H(x,t) ~ DsUL~ sinf{F1H+ξ(F1+F2)(H+ξ/(1+ξ)E)}df Unpolarized beam, transverse target: E(x,t) DsUT~ sinf{k(F2H – F1E)}df

  4. DVCS beamasymmetryat 12 GeV CLAS12 sinφ moment of ALU epepg High luminosity and large acceptance allows wide coverage in Q2 < 8 GeV2, xB< 0.65, and t< 1.5GeV2

  5. Separate Sivers and Collins effects Sivers angle, effect in distribution function: (fh-fs) Collins angle, effect in fragmentation function: (fh+fs) SIDIS Electroproduction of Pions • Previous data from HERMES,COMPASS • New landscape of TMD distributions • Access to orbital angular momentum target angle hadron angle Scattering Plane

  6. Total 1400 bins in x, Q2, PT and z for 11/8.8 GeV beam. z ranges from 0.3 ~ 0.7, only one z and Q2 bin of 11/8.8 GeV is shown here. π+ projections are shown, similar to the π- . SoLIDTransversity Projected Data

  7. Quark Angular Momentum →Access to quark orbital angular momentum

  8. Parity Violating Electron Scattering

  9. Into the “sea”: EIC • An EIC aims to study gluon dominated matter. • With 12 GeV we study mostly the valence quark component mEIC EIC 12 GeV

  10. TMD studies at EIC 10 fb-1 @ each s (from EIC White Paper)

  11. Extending Sivers Tomography A. Prokudin

  12. Longitudinal Spin - DG 10 fb-1 – Stage 1 (from EIC White Paper)

  13. Gluon Tomography DV J/Y Production (from EIC White Paper)

  14. Precision Tests of the Standard Model 200 fb-1

  15. MEIC Design Report • Web posting imminent • Stable design for 3 years

  16. Medium Energy EIC@JLab SRF linac Pre-booster Warm large booster (up to 20 GeV) Transfer beam line Ion source Cold ion collider ring (up to 100 GeV) Electron collider ring (3 to 11 GeV) Medium energy IP Injector • JLab Concept • Initial configuration (MEIC): • 3-11 GeV on 20-100 GeVep/eAcollider • fully-polarized, longitudinal and transverse • luminosity: up to few x 1034 e-nucleons cm-2s-1 • Upgradable to higher energies (250 GeV protons) 12 GeV CEBAF

  17. MEIC: FullAcceptance Detector 7 meters detectors solenoid ion FFQs ion dipole w/ detectors ions IP 0 mrad electrons electron FFQs 50 mrad 2+3 m 2 m 2 m Three-stage detection Central detector TOF Detect particles with angles below 0.5obeyond ion FFQs and in arcs. Need 4 m machine element free region Detect particles with angles down to 0.5obefore ion FFQs. Need 1-2 Tm dipole. Solenoid yoke + Muon Detector RICH or DIRC/LTCC Tracking RICH EM Calorimeter HTCC 4-5m Muon Detector Hadron Calorimeter EM Calorimeter Very-forward detector Large dipole bend @ 20 meter from IP (to correct the 50 mr ion horizontal crossing angle) allows for very-small angle detection (<0.3o). Need 20 m machine element free region Solenoid yoke + Hadronic Calorimeter 2m 3m 2m

  18. My View Going Forward • There has been excellent progress on developing the EIC science case over the last 2 years, and even more since the INT program. • There have been important contributions from both the BNL and JLab communities. • I continue to believe that it is essential that these two communities work together to realize the recommendation of an EIC by the broader nuclear physics community. • Completing the White Paper is a crucial next step in this process. • Many thanks to the WP writers/editors.

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