wgE4: CHARGE

With the Tevatron and the LHC we anticipate an exciting decade of discovery physics with hadron colliders (ppbar and pp) exploring the energy frontier. The task of this working group is to look beyond these immediate prospects to develop a clear vision of future physics at hadron and lepton-hadron colliders. This group should work in close collaboration with its counterparts, M4: Hadron Colliders, and M5: Lepton-Hadron Colliders.

  1. Hadron-Hadron
    1. Physics potential
      1. What is the physics potential for a pp or ppbar collider operating at center-of-mass energies of 100 - 200 TeV?
      2. What about 30-40 TeV?
      3. Elaborate on possible physics discoveries in this decade which would point the way to specific physics opportunities at a future Very Large Hadron Collider (VLHC). This task should be closely coordinated with working groups P3: Scales Beyond 1 TeV and P1: Electroweak Symmetry Breaking.
    2. luminosity
      1. Examine the importance of luminosity for a VLHC collider, both for more generic physics measurements, and for specific physics opportunities.
      2. Compare pp and ppbar physics potential taking into account the likely differential in luminosity.
    3. detectors
      1. Identify the main challenges of building and operating detectors for a VLHC.
      2. Identify particular issues that detector R&D must address to guarantee the productivity of a VLHC.
    4. LHC upgrades
      1. Examine the physics potential of possible energy and luminosity upgrades to the LHC (superLHC). This should include both discovery potential and the role of higher energy in a mature program of detailed measurements of physics at the TeV scale.
    5. B physics
      1. Explore the ultimate reach of the mature Tevatron and LHC colliders for B physics.
      2. Will we need upgrades or extensions to the BTeV and LHCb experiments in order to maximize their ability to make essential measurements?
  2. Lepton-Hadron
    1. lepton-hadronWhat is the physics potential for THERA, eRHIC, and other possible next generation lepton-hadron colliders?
    2. What is the physics driving a 1 - 1.5 TeV center-of-mass ep collider?
    3. What is the physics driving a lower energy e-nucleus collider, or an ep collider with polarization in both beams?
  3. Strategy
    1. Staging/R&D
      1. Examine the importance of flexibility in the design and staging of future hadron collider projects, including a moderate-energy electron-positron collider in the big ring.
      2. Identify the critical R&D issues whose vigorous pursuit will optimize our ability to respond to a variety of possible new physics discoveries.
      3. Are there particular issues that detector R&D must address to guarantee the productivity of a veryolarge hadron collider?
    2. Collaboration
      1. How can full international collaboration on a hadron collider project be realized?
      2. Is it feasible to assign full responsibility for design, construction, commissioning, test and operation of major subsystems to different portions of the world community while maintaining effective overall project management?
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