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R. D. McKeown Jefferson Lab College of William and Mary

The 12 GeV Science Program at Jefferson Lab. R. D. McKeown Jefferson Lab College of William and Mary. Hadron Physics Workshop Weihai , China August 8, 2011. Outline. CEBAF 12 GeV Upgrade Project - Capabilities - Status 12 GeV Research Program

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R. D. McKeown Jefferson Lab College of William and Mary

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  1. The 12 GeVScience Program at Jefferson Lab R. D. McKeown Jefferson Lab College of William and Mary Hadron Physics Workshop Weihai, China August 8, 2011

  2. Outline • CEBAF 12 GeV Upgrade Project - Capabilities - Status • 12 GeVResearch Program • Beyond 12 GeV - Electron Ion Collider

  3. 12 GeV Upgrade Project New Hall Add 5 cryomodules 20 cryomodules Add arc 20 cryomodules Add 5 cryomodules Enhanced capabilities in existing Halls Upgrade arc magnets and supplies CHL upgrade Maintain capability to deliver lower pass beam energies: 2.2, 4.4, 6.6…. • Scope of the project includes: • Doubling the accelerator beam energy • New experimental Hall and beamline • Upgrades to existing Experimental Halls

  4. 12 GeV Scientific Capabilities Hall D – exploring origin ofconfinementby studying exotic mesons Hall B – understanding nucleon structureviageneralized parton distributions Hall C – precision determination of valence quarkproperties in nucleons and nuclei Hall A – short range correlations, form factors, hyper-nuclear physics, futurenew experiments (e.g., PV and MOLLER)

  5. 12 GeV Upgrade Schedule Two short parasitic installation periods in FY10 6-month installation May – Oct 2011 12-month installation May 2012 – May 2013 Hall A commissioning start October 2013 Hall D commissioning start April 2014 Halls B/C commissioning start October 2014 Project Completion June 2015

  6. Hall D Status – July 2011 Ready For Equipment (RFE) Dec. 28, 2010

  7. Arc Dipole Installation

  8. 12 GeV Science Program • The physical origins of quark confinement (GlueX, meson and baryon spectroscopy) • The spin and flavor structure of the proton and neutron (PDF’s, GPD’s, TMD’s…) • The quark structure of nuclei • Probe potential new physics through high precision tests of the Standard Model • Defining the Science Program: • Six Reviews: Program Advisory Committees (PAC) 30, 32, 34, 35, 36, 37 • 2006 through 2011 • Results: 45 experiments approved; 14 conditionally approved • PAC38 scheduled August 2011: consider new proposals, continue rankings Exciting slate of experiments for 4 Halls planned for initial five years of operation!

  9. PAC 12 GeV Science Categories • The Hadron spectra as probes of QCD(GlueX and heavy baryon and meson spectroscopy) • The transverse structure of the hadrons (Elastic and transition Form Factors) • The longitudinal structure of the hadrons (Unpolarized and polarized parton distribution functions) • The 3D structure of the hadrons(Generalized Parton Distributions and Transverse Momentum Distributions) • Hadrons and cold nuclear matter(Medium modification of the nucleons, quark hadronization, N-N correlations, hypernuclear spectroscopy, few-body experiments) • Low-energy tests of the Standard Model and Fundamental Symmetries(MOLLER, PVDIS, PRIMEX, …..)

  10. 12 GeV Approved Experiments by Physics Topics More than 5 years running time

  11. Hall D

  12. Quantum Numbers of Hybrid Mesons Exotic like Flux tube excitation (and parallel quark spins) lead to exotic JPC Excited Flux Tube Quarks Hybrid Meson like

  13. +- 2 +- 0 -+ 1 Hall D@JLab Isovector Meson Spectrum States with Exotic Quantum Numbers Dudek et al.

  14. Proton Spin Puzzle [X. Ji, 1997] • DIS → DS  0.25 • RHIC + DIS → Dg« 1 • → Lq D. de Florian et al., PRL 101 (2008) 072001

  15. Unified View of Nucleon Structure d3r TMD PDFs f1u(x,kT), .. h1u(x,kT)‏ 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

  16. 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

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

  18. DVCS beamasymmetryat 12 GeV CLAS12 sinφ moment of ALU Experimental DVCS program E12-06-119 was approved for the 12 GeV upgrade using polarized beam and polarized targets. ep epg High luminosity and large acceptance allows wide coverage in Q2 < 8 GeV2, xB< 0.65, and t< 1.5GeV2

  19. High x spin dependent DIS • REQUIRES: • High beam polarization • High electron current • High target polarization • Large solid angle spectrometers

  20. Separate Sivers and Collins effects Sivers angle, effect in distribution function: (fh-fs) = angle of hadron relative to initial quark spin Collins angle, effect in fragmentation function: (fh+fs) = p+(fh-fs’) = angle of hadron relative to final quark spin SIDIS Electroproduction of Pions q target angle hadron angle Scattering Plane e-e’ plane

  21. A Solenoid Spectrometer for SIDIS SIDIS SSAs depend on 4 variables (x, Q2, z and PT ) Large angular coverage and precision measurement of asymmetries in 4-D phase space are essential.

  22. 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

  23. Super Bigbite Spectrometer (SBS) in Hall A • General purpose device • Well-suited to form factor expts • ~$5M total, construction: 2013-5 • Review proposed for fall 2011 48D48 magnet Beam

  24. MOLLER & Deep Inelastic Scattering Parity Violationin Hall A • Dedicated MOLLER Experiment • (successor to SLAC E158) • DOE MIE proposal → CD-0 • SoLID (solenoidal large intensity device): general purpose deep inelastic parity violating experiment with solenoid • Chinese contribution

  25. Future PV Program

  26. New Opportunity: Search for A’ at JLab Va. Tech. Physics Colloquium, Dec. 3, 2010 Search for new forces mediated by ~100 MeV vector boson A’ with weak coupling to electrons: g – 2 preferred! • New ~GeV–scale force carriers are important category of physics beyond the SM. • A’ could couple to dark matter and explain some anomalous astrophysical data. • Fixed-target experiments @JLab(FEL + CEBAF) have unique capability to explore this!

  27. Into the “sea”: EIC • With 12 GeV we study mostly the valence quark component • An EIC aims to study the sea quarks, gluons, and scale (Q2) dependence. mEIC EIC 12 GeV

  28. Medium Energy EIC@JLab • Three compact rings: • 3 to 11 GeV electron • Up to 12 GeV/c proton (warm) • Up to 60 GeV/c proton (cold)

  29. EIC Realization Imagined

  30. Outlook • 12 GeV Physics program is well developed and expanded • “Beyond Standard Model” program is growing • Parity violation • New gauge boson searches • Construction Project is on track • New equipment requirements (Hall A) • Super Bigbite Spectrometer (SBS) • MOLLER • SoLID • Beyond 12 GeV EIC…

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