Leipzig 2002 – scientific programme
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T: Teilchenphysik
T 406: Elektroschwache Wechselwirkung III
T 406.1: Talk
Thursday, March 21, 2002, 14:00–14:15, HS 8
Strong Electroweak Symmetry Breaking signals in WW scattering at TESLA Linear Collider — •Stefano Rosati1, Michael Kobel1, and Roberto Chierici2 — 1Physikalisches Institut der Universität Bonn — 2CERN
One of the most outstanding problems in modern particle physics is how the breaking of the SU(2)L×U(1)Y gauge symmetry is realized in Nature. In absence of light Higgs Bosons, new physics coupled to the Standard Model is needed at the TeV scale to restore the unitarity of the model. A larger symmetry should exist, breaking down to SU(2)L×U(1)Y, and giving longitudinal components and masses to W and Z bosons. Elastic scattering of W and Z bosons is hence the basic testground for this new interaction.
WW scattering at low energies can be effectively described by the Electroweak Chiral Lagrangian, containing the gauge interactions plus five additional 4-dimensional interaction terms. We present an experimental study on possible limits on the coefficients of the Chiral Lagrangian, and on the related New Physics scale. In this study a realistic simulation of the TESLA detector was used, assuming √s=800 GeV, 1000 fb−1 of integrated luminosity and 80% (40%) e− (e+) beam polarisations. Experimental analyses of the channels e+e−→ WWνν→ qqqqνν, e+e−→ WZeν → qqqqeν, e+e−→ ZZνν → qqqqνν, and of all relevant background processes were performed and the expected error on the cross section measurement was optimized. The expected sensitivity to the coefficients of the Chiral Lagrangian was evaluated through a binned maximum likelihood fit.