gg and e - e - options working group report
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NLC - The Next Linear Collider Project
and e-e- options working group report
Jeff Gronberg/LLNL
For the and e-e- working groups
ALCPG Workshop Cornell
July 12-16 , 2003This work was performed under the auspices of the U.S. Department of Energy by the University of California, Lawrence Livermore National Laboratory under Contract No. W-7405-Eng-48.
NLC - The Next Linear Collider Project
Warm and Cold technology
• Photon collider technologies for both warm and cold accelerators are under development– Warm technology based on
MERCURY laser is being developed at LLNL
– Cold technology using recirculating cavity being designed at DESY / MBI
– Both are funding limited
• Looking for R&D issues common to both for work before the technology decision– Optics damage from high power lasers
and radiation– Effect of beam disruption from
Compton on the beam-beam feedback
NLC - The Next Linear Collider Project
Current status of H
• IWSLC Jeju panel determined that is an important capability to retain for the LC
– Higgs
• SM light Higgs bb, W+W- and done
• SUSY Heavy H0, A bb done
– CP determination of Higgs with linear polarization
• Exploring technical options to improve CP measurement with linear polarized beam
• Extending analyses to Higgs ZZ, Z– Pandora-pythia with H ZZ and Z cross sections
– Including , ZZ, Z backgrounds in pandora
• Two-photon background rate determined to be 1.8 / crossing in NLC500G– We will examine the effect on jet recon as a function of integrated crossings
– Feedback / study from detector groups about how few crossing we can integrate
NLC - The Next Linear Collider Project
Physics studies of new models
• Impact of MSSM on the SM light Higgs Analysis– The ratio of MSSM / SM of (h) x BR(h bb) still yields a good
measurement over most of MA, tan() space.
• NMSSM with extra CP+ and CP- Higgs– Light h aa bbbb checked, where LHC sees a hint, can make a
mass measurement.
• Complex MSSM model– h aa bbbb will be applied to this model as well
• Littlest Higgs hep/ph-0302188– Partial widths of loop decays (hgg) versus (h) probe the model
parameters. Greatest sensitivity with data.
• Radion-Higgs Mixing hep/ph-0304245– Will be observable at – Combining information with LHC probes anomalous couplings in this
model.
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