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UK Hadron Physics

UK Hadron Physics. D. G. Ireland. Nuclear Physics Landscape. Key Physics Questions. Confinement. Generation of Mass. Nucleon Spin. Which facilities are used?. Edinburgh. Glasgow. MAX-Lab, Lund. Mainz. Jefferson Lab. Jefferson Lab (and 12 GeV Upgrade). New Hall. Add 5 cryomodules.

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UK Hadron Physics

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  1. UK Hadron Physics D. G. Ireland NuPECC Meeting, Edinburgh

  2. Nuclear Physics Landscape

  3. Key Physics Questions Confinement Generation of Mass Nucleon Spin

  4. Which facilities are used? Edinburgh Glasgow MAX-Lab, Lund Mainz Jefferson Lab

  5. Jefferson Lab (and 12 GeVUpgrade) New Hall Add 5 cryomodules 20 cryomodules Add arc 20 cryomodules Add 5 cryomodules The completion of the 12 GeV Upgrade of CEBAF was ranked the highest priority in the 2007 NSAC Long Range Plan. Upgrade arc magnets and supplies CHL upgrade Enhanced capabilities in existing Halls Scope of the project includes: • Doubling the accelerator beam energy • New experimental Hall and beamline • Upgrades to existing Experimental Halls 8 January 2014

  6. JLab - Hall A High Resolution Spectrometers, plus BigBite

  7. JLab - Hall A Upgrade High Resolution Spectrometers, plus BigBite plus Super Bigbite Spectrometer (SBS)

  8. JLab – Hall B

  9. JLab – Hall B Upgrade CLAS12 Forward Tagger

  10. The MAMI Facility One of the MAMI-C magnets  e • 100% duty factor electron microtron • MAMI-C 1.5 GeV upgrade (MAMI-B 0.85 GeV)

  11. Crystal Ball at MAMI g DEg ~ 2 MeV 108g sec-1

  12. Nucleon Structure

  13. Reactions Elastic Scattering Semi-Inclusive Deep Inelastic Scattering (SIDIS) Deeply Virtual Compton Scattering (DVCS)

  14. Nucleon Form Factors Q2=q2-n2

  15. Quark Distributions Projected SBS/BB data 11 GeV 8.8 GeV 6.6 GeV JLab Upgrade 14

  16. Baryon Resonances Quark Model N* Resonances Quark Model D* Resonances Lattice QCD

  17. CLAS results γp→K+Λ→K+pπ- Bonn-Gatchina Coupled Channel Analysis, A.V. Anisovich et al, EPJ A48, 15 (2012) (Includes nearly all new photoproduction data) M. Mc Cracken et al. (CLAS), Phys. Rev. C 81, 025201, 2010 R. Bradford et al. (CLAS), Phys.Rev. C75, 035205, 2007

  18. Evidence for new N* states and couplings

  19. Coherent Pion Photoproduction Photon probe  Interaction well understood p0 meson – produced with ~equal probability on protons AND neutrons. Reconstruct p0 from p0→2g decay • Angular distribution of p0 → PWIA contains the matter form factor • p0 final state interactions - use latest complex optical potentials tuned to p-A scattering data. Corrections modest at low pion momenta ds/dW(PWIA) = (s/mN2)A2 (qp*/2kg) F2(Eg*,qp*)2 |Fm(q)|2 sin2qp*

  20. 208Pb neutron skin

  21. Comparison with previous measurements Coherent pion } Droplet Analyses using theory, expt, observation. Nstar + QMC Latimer Tsang PREX Pygmy dipole Electric dipole Heavy ion diffusion Antiprotonic atoms Proton scattering Pion scattering Drnp

  22. Future directions

  23. Structure Functions 0.0 0.5 -0.5 0.5 ky 0.0 -0.5 bx [fm] kx GPDs TMDs 2+1 D picture in impact-parameter space 2+1 D picture in momentum space Lattice QCD F1T┴(x) [Sivers function] quark density QCDSF/UKQCD Coll., 2006 Anselmino et al., 2009 • Accessed through exclusive processes • Ji sum rule for nucleon spin • Accessed through Semi-Inclusive DIS • OAM through spin-orbit correlations?

  24. Future directions… Hadron Spectroscopy • Exotic mesons • Very strange baryons

  25. The Search for “Dark Photons”

  26. Sea quarks and the glue that binds us all Proton parton density functions (PDFs)

  27. Electron-Ion Collider Designs Stage I Stage II eRHIC @ BNL √s = 34 – 71 GeV Ee = 3 – 5 (10 ?) GeV Ep = 100 – 255 GeV EPb = up to 100 GeV/A √s = up to ~180 GeV Ee = up to ~30 GeV Ep = up to 275 GeV EPb = up to 110 GeV/A MEIC / EIC @ JLab √s = up to ~140 GeV Ee = up to 20 GeV Ep = up to at least 250 GeV EPb = up to at least 100 GeV/A √s = 13 – 70 GeV Ee = 3 – 12 GeV Ep = 15 – 100 GeV EPb = up to 40 GeV/A (MEIC) (EIC)

  28. Summary Edinburgh Glasgow MAX-Lab, Lund Mainz Jefferson Lab

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