Physics

Machine Parameters

To be used as common guidelines unless otherwise specified.

Energies:
- 350 GeV
- 500 GeV
- 800 GeV
The possibility to have energy points down to LEP1/2 and energies up to 2 TeV should also be kept in mind.
Luminosity:
- 500 fb-1
  This should be taken as reference number for one to two years of TESLA high-luminosity running at each energy, so one could assume a total integrated luminosity of a few ab-1.
Polarization:
- electron polarization: 80...90% for high...low luminosity
- positron polarization: 60% (uncertain)
Beam spectra and beamstrahlung:
- CIRCE program (with the high-luminosity TESLA option and 350, 500 or 800 GeV energy)
e-e- collisions:
- energies and integrated luminosities assumed to be the same as above
gamma-gamma:
- use spectra from Compton back-scattering of laser light as suggested in the literature

Standard processes
- Subprocesses:
  - e+ e- -> e+ e- and e- e- -> e- e-
  - e+ e- -> mu+ mu- and tau+ tau-
  - e+ e- -> q qbar
  - e+ e- -> gamma gamma and Z gamma
  - e gamma -> e gamma and e Z
  - e gamma -> nu W
  - gamma gamma -> mu+ mu-
  - gamma gamma -> q qbar
- Physics case:
  - high-precision analyses
  - window to new-physics scenarios
Top quark physics and QCD
- Subprocesses:
  - e+ e- -> t tbar -> 6 q's etc.
- Physics case:
  - top mass (from threshold scan) and alpha_s
  - charges and magn./el. dipole moments
  - t -> b W decay parameters
  - e+ e- -> ttH Higgs-top Yukawa coupling
  - non-SM decays: t -> b H, stop chi0
    c gamma, c Z
- Subprocesses:
  - e+ e- -> hadrons
  - e+ e- -> q qbar ngluons
- Physics case:
  - running QCD coupling alpha_s
  - QCD evolution of fragmentation
- Subprocesses:
  - gamma(*) gamma(*) -> q qbar
  - e gamma(*) -> e X
- Physics case:
  - total gamma(*) gamma(*) hadronic cross section
  - non-perturbative/perturbative BFKL physics
  - jets and mini-jets
  - photon structure functions
Standard and non-standard gauge theories
- Subprocesses:
  - e+ e- -> W+ W- -> q qbar l nu etc. (low/high energies)
  - e+ e- -> nubar nu WW
  - e+ e- -> Z
- Physics case:
  - W mass measurements
  - ultra-precision measurement of elw mixing angle
  - anomalous couplings in gauge boson sector
  - strongly interacting WW scattering
- Subprocesses:
  - e+ e- -> f fbar, f Fbar, F Fbar (f/F = SM/new fermion)
  - e+ e- -> W+W- and ZZ
- Physics case:
  - real/virtual effects of new Z' bosons in extended gauge theories (SO(10), E(6) etc.)
  - new leptons and quarks (charged, neutral, Majorana)
Higgs particles
- Subprocesses (Standard Model):
  - Higgsstrahlung e+ e- -> ZH
  - fusion e+ e- -> nubar nu H
    e+ e- -> e+ e- H
  - gamma gamma -> H
- Physics case:
  - Higgs mass
  - partial and total Higgs widths/branching ratios
  - production cross sections
  - spin-parity assignment 0+
  - couplings to W, Z and leptons/quarks
  - ttH Yukawa coupling in ee -> ttH
  - Higgs self-coupling in ee -> ZHH and nubar nu HH
  - strongly interacting W/H bosons in e+ e- -> nubar nu WW etc.
- Subprocesses (SUSY):
  - Higgsstrahlung e+ e- -> Zh and ZH
  - fusion e+ e- -> nubar nu h and H
  - pair production e+ e- -> A h and A H
  - gamma gamma -> h, H, and A
- Physics case:
  - h, H, A, H+- properties:
    - masses
    - couplings to vector bosons and fermions
    - self-couplings in multi-Higgs processes
  - extended Higgs sector: no-lose theorem
Supersymmetric particles
- Physics case:
  - masses, couplings, mixing parameters from threshold scans, cross sections (polarized beam for particle diagnostics)
  - decay characteristics
  - SUSY-GUTs:
    - very large tan beta solution (see this report)
    - m-supergravity mSUGRA
    - gauge mediated SUSY breaking GMSB
Alternative theories
- Topics:
  - electron radius from e- e- -> e- e-
  - charges and dipole moments of leptons/quarks
  - heavy/excited fermions
  - leptoquarks
  - contact interactions
  - technicolor theories
  - lepton-flavor violation

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For comments or additions to this page send mail to Peter Zerwas (zerwas@desy.de).

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