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.