Dresden 2013 – scientific programme

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T: Fachverband Teilchenphysik

T 11: Elektroschwache Physik (Theorie) 2

T 11.8: Talk

Monday, March 4, 2013, 18:30–18:45, WIL-A120

A neutral scalar singlet as Higgs imposter — •Hanna Hoffmann, Michael Rauch, and Dieter Zeppenfeld — Karlsruher Institut für Technologie (KIT), Karslruhe, Germany

Recently, the LHC has discovered a resonance at 126 GeV, and first measurements of its properties show agreement with those of a Standard Model Higgs boson. In this talk, we investigate the possibility of an alternative hypothesis, that the resonance is an additional neutral scalar singlet S. The interactions of S with the gauge bosons are described via an effective Lagrangian consisting of dimension five operators. The free coupling constants appearing in the Lagrangian are then adjusted, such that the decay rates of the 126 GeV resonance are reproduced as good as possible. We find that a significant amount of fine tuning is necessary to achieve this. Finally, we also investigate how mediator particles could induce such couplings at the loop level.