Hamburg 2016 – wissenschaftliches Programm
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T: Fachverband Teilchenphysik
T 47: Higgs-Boson (Eigenschaften) (theo.+exp.)
T 47.6: Vortrag
Dienstag, 1. März 2016, 18:00–18:15, VMP5 HS B1
Probing CP Properties of the discovered bosonic resonance with Higgs signal rates from Tevatron and LHC data — •Tobias Klingl1, Philip Bechtle1, Tim Stefaniak2, and Klaus Desch1 — 1Universität Bonn — 2University of California, Santa Cruz
In July 2012, the ATLAS and CMS collaborations reported the discovery of a single, narrow bosonic resonance φ with mass of 125 GeV. Although a pure CP-odd state can be excluded by the current data, it is still possible that the CP properties of this resonance deviate from the expectations for a pure CP-even Standard Model (SM) Higgs boson. In general it can be an admixture of a CP-even Higgs-like scalar h and a CP-odd pseudoscalar A described by the general parametrization φ=cosα h + sinα A. We investigate the scope of possible discrepancies between the CP properties and the couplings of the discovered resonance and the properties of a SM Higgs boson. To this end, we consider a Higgs coupling scale factor benchmark scenario with scalar and pseudoscalar scale factors for the Higgs couplings to fermions and one scalar scale factor for the SU(2) gauge bosons. The latter coupling is assumed to be ≤ 1, as predicted in many models such as SUSY or the 2HDM. Additionally, we allow for non-SM Higgs boson decays into invisible final states. We perform χ2 fits to the available data from the Tevatron and LHC experiments using the Computer Code HiggsSignals, which takes into account signal efficiencies and major correlations of experimental and theoretical uncertainties. We obtain constraints on the mixing angle α and the scalar and pseudoscalar couplings of the field φ.