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The LHeC and Physics at High Parton Densities

The working group on `Physics at High Parton Densities (ep and eA)' plans to explore new opportunities in low x physics at the LHeC with electrons scattering on protons and heavy ions. If you are interested in participating in these studies, please contact the convenors as soon as possible.

Previous studies at HERA, RHIC and the Tevatron have shown gluon and sea quark densities which grow fast as x decreases, leading to questions of unitarisation, parton recombination, the Colour Glass Condensate and other novel strong interaction dynamics. As yet, however, no clear picture has been established. The previously unexplored LHeC low x kinematic region (reaching x ~ 10-6 at Q2 ~ 1 GeV2) could provide a clear understanding of physics at high parton densities in a kinematic region to which perturbative techniques may be applied. Some topics for possible study are listed below. We welcome further suggestions!

  •                       - Measuring F2 and FL in low x ep and eA Collisions           (some first simulated data)
  •                       - Nucleon PDFs at small x
  •                       - Nuclear PDFs
  •                       - Resummation at Low x
  •                       - Non-linear Evolution Equations
  •                       - Observing the onset of Parton Saturation in ep Physics
  •                       - The Dipole approach to Low x Physics
  •                       - Geometric Scaling
  •                       - Theory of High Density QCD at eA Colliders
  •                       - Mueller-Navelet Jets and Other `Forward' Observables
  •                       - Describing Low x Evolution Dynamics (DGLAP, CCFM, BFKL ...)
  •                       - Monte Carlo modelling at Low x
  •                       - Measuring Vector Meson and DVCS Processes
  •                       - Generalised Parton Densities
  •                       - Measuring Diffractive DIS (Rapidity Gaps and tagged protons)           (some first simulated data)
  •                       - Theory of Diffractive DIS and Diffractive Factorisation
  •                       - Multiple Interactions and Rapidity Gap Survival
  •                       - Leading Neutron Measurements
  •                       - Heavy Flavour Measurements as Low x Probes
  •                       - Quark Fragmentation