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Future lepton scattering facilities

Future lepton scattering facilities

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Future lepton scattering facilities

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  1. Future lepton scattering facilities NuPECC working group TullioBressani, INFN, Torino Univ. Jens JørgenGaardhøje, Niels Bohr Inst. Günther Rosner, Glasgow Univ. (chair) Hans Ströher, FZ Juelich (No externals yet) NuPECC Madrid 7/3/08

  2. Laboratories MAX-lab: 0.25 GeV  DESY: HERMES 28 GeV e+, e- L = 1032 H1, ZEUS FZ Jülich: COSY 2.5 GeV p Cooler Ring TSL: Celsius 1.3 GeV p Cooler Ring MAMI: 1.5 GeV e-, L = 1038 108/s  ELSA: 3.5 GeV e, L = 1034 107/s  RHIC:100+100 GeV p/A CERN: COMPASS μ+, μ-, hadrons 200 GeV, L = 1032 ALICE LHeC? FAIR: PANDA 15 GeV anti – pCooler Ring L = 2x1032 PAX?CBM EIC? ESRF: GRAAL 106/s 1.5 GeV  JLab:6 GeV e- , L = 1038107/s  12 GeV upgrade LNF: DANE e+e- Collider 16 MeV K, L = 1032DANE 2? Super B? NuPECC Madrid 7/3/08

  3. Nucleon Key questions in hadron physics • Mechanism of quark confinement • Generation of hadron masses • Spontaneous chiral symmetry breaking • QCD vacuum, quark condensates • Nucleon structure • Transverse structure • Spin puzzle • Parton correlations • Gluon density saturation • New forms of hadronic matter • Exotic multi-quark states • Exotic mesons • Glueballs NuPECC Madrid 7/3/08

  4. Experimental & theoretical challenges • Experimental frontier • High precision • High luminosity • Polarisation • Beam • Target • Pol. Transfer • Higher c.o.m energies! • Theoretical symbiosis • Effective field theories • Lattice QCD • Perturbative QCD NuPECC Madrid 7/3/08

  5. Generalised Parton Distributions • Measure hardexclusive reactions • at • HERMES, COMPASS • PANDA • JLab 12GeV • EIC NuPECC Madrid 7/3/08

  6. The nucleon spin puzzle HERMESCOMPASSRHIC-Spin EIC Gluon orbitalangular momentum(accessible through GPDs, difficult) Gluon polarisationpositive (HERMES)negative (SMC) HERMESCOMPASS JLab 12 GeVPANDAEIC HERMES:   0.3 Quark orbitalangular momentum(accessible through GPDs) Transversity HERMES, COMPASS PANDA, PAX NuPECC Madrid 7/3/08

  7. Nucleon tomography via GPDs NuPECC Madrid 7/3/08

  8. European issues • Since the 1980’s • ELFE @ Saclay (≥2 GeV e- fixed target) • ELFE @ DESY (≥10 GeV e- fixed target) • ELFE @ CERN (≥20 GeV e- fixed target) • EIC @ GSI (ep/eA collider) • TESLA N (≥200 GeV fixed target) • EVELYN @ DESY (≥50 GeV fixed target) • Problems • Difficult international environment • No adequate host lab • What do we learn from this history? NuPECC Madrid 7/3/08

  9. USA: Electron-Ion Collider 20-100 GeVcom NuPECC Madrid 7/3/08

  10. NSAC 2007 An Electron-Ion Collider (EIC) with polarized beams has been embraced by the U.S. nuclear science community as embodying the vision for reaching the next QCD frontier. EIC would provide unique capabilities for the study of QCD well beyond those available at existing facilities worldwide and complementary to those planned for the next generation of accelerators in Europe and Asia. In support of this new direction: • We recommend the allocation of resources to develop accelerator and detector technology necessary to lay the foundation for a polarized Electron Ion Collider. The EIC would explore the new QCD frontier of strong color fields in nuclei and precisely image the gluons in the proton. NuPECC Madrid 7/3/08

  11. NSAC • Develop the Science Case • Choose Site? • Develop Sound Cost Basis • What is cost versus science tradeoff • Secure the NP doubling budget • LRP 2012 very important (i.e. critical?) for EIC Robert Tribble, 7 Dec 2007 NuPECC Madrid 7/3/08

  12. CERN: Large Hadron electron Collider NuPECC Madrid 7/3/08

  13. Parton distribution functions NuPECC Madrid 7/3/08

  14. LHeC double rings NuPECC Madrid 7/3/08

  15. LHeC roadmap • Feasibility study endorsed by CERN and ECFA • First ECFA-CERN Workshop on the LHeC in Divonne, 1-3/9/08 • Goal: Conceptual Design Report by end of 2009, early 2010, on: • Accelerator • Interaction regions • Detector • Infrastructure • Physics • New Physics • High Precision QCD + electroweak • High parton densities (low x + eA) http://www.lhec.org.uk NuPECC Madrid 7/3/08

  16. Kinematic coverage NuPECC Madrid 7/3/08

  17. (Optimistic) Timelines •  2007: • Accelerators • MAX-lab, MAMI C, BEPCII, LHC, JPARC • Experiments • HERMES, COMPASS, BESIII, WASA, ALICE • >2012: • Accelerators • JLab12 GeV, FAIR, DAFNE 2?, Super-B factory?, RHIC 2? • Experiments • CLAS 12, GlueX, PANDA,CBM, COMPASS?, KLOE 2?, Super-BELLE? • >2017: • Accelerators • Proton-antiproton collider at FAIR? • EIC? • Experiments • PAX? • Electron-ion exp.? • > 2022: • Accelerator • LHeC? NuPECC Madrid 7/3/08