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T: Fachverband Teilchenphysik

T 16: Beyond the Standard Model (Theorie) 2

T 16.4: Talk

Tuesday, February 28, 2012, 17:30–17:45, VG 3.102

Unitarity in weak-boson scattering: Spin-0, spin-1 or spin-2 resonances? — •Jessica Frank, Franziska Schissler, and Dieter Zeppenfeld — IThP, Karlsruhe Institute of Technology, 76128 Karlsruhe, Germany

In the Standard Model, the unitarity of the S-matrix in weak-boson scattering is preserved by the Higgs boson. Higgsless models have to provide an alternative to restore the unitarity of weak-boson scattering amplitudes, which otherwise grow with the center-of-mass energy, eventually violating unitarity.

In this talk, we investigate to what extent new spin-1 or spin-2 resonances can delay this problem. Thereby, we focus on fermiophobic spin-1 resonances, working in a model-independent approach which is based on sum-rules. We find that light spin-1 resonances can preserve unitarity in the elastic scattering channels. Furthermore, we briefly discuss the unitarity of inelastic channels with these new spin-1 particles in the final state.