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

2. CERN: COMPASS μ+, μ-, hadrons
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: GeV p/A
CERN: COMPASS μ+, μ-, hadrons
200 GeV, L = 1032
ALICE
LHeC?
FAIR: PANDA
15 GeV anti – p Cooler Ring
L = 2x1032
PAX? CBM
EIC?
ESRF: GRAAL
106/s 1.5 GeV 
JLab: 6 GeV e- , L = /s 
12 GeV upgrade
LNF: DANE
e+e- Collider
16 MeV K, L = 1032 DANE 2?
Super B?
Günther Rosner
NuPECC Madrid 7/3/08

3. 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
Nucleon
Günther Rosner
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
Günther Rosner
NuPECC Madrid 7/3/08

5. Generalised Parton Distributions
Measure hard exclusive reactions at
HERMES, COMPASS
PANDA
JLab 12GeV
EIC
Günther Rosner
NuPECC Madrid 7/3/08

6. The nucleon spin puzzle
HERMES COMPASS RHIC-Spin  EIC
Gluon orbital angular momentum (accessible through GPDs, difficult)
Gluon polarisation positive (HERMES) negative (SMC)
HERMES COMPASS  JLab 12 GeV PANDA  EIC
HERMES:   0.3
Quark orbital angular momentum (accessible through GPDs)
Transversity
HERMES, COMPASS  PANDA, PAX
Günther Rosner
NuPECC Madrid 7/3/08

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

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

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

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

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

14. LHeC double rings
Günther Rosner
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)
Günther Rosner
NuPECC Madrid 7/3/08

16. Kinematic coverage
Günther Rosner
NuPECC Madrid 7/3/08

17. (Optimistic) Timelines
 2007:
Accelerators
MAX-lab, MAMI C, BEPCII, LHC, JPARC
Experiments
HERMES, COMPASS, BESIII, WASA, ALICE
> 2012:
JLab 12 GeV, FAIR, DAFNE 2?, Super-B factory?, RHIC 2?
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?
Günther Rosner
NuPECC Madrid 7/3/08