Würzburg 2018 – wissenschaftliches Programm
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T: Fachverband Teilchenphysik
T 10: Higgs: Erweiterte Modelle I
T 10.10: Vortrag
Montag, 19. März 2018, 18:15–18:30, Z6 - HS 0.004
Probing CP Properties of the Higgs boson with Higgs signal rates from Tevatron and LHC data — •Tobias Klingl1, Philip Bechtle1, Tim Stefaniak2, Sven Heinemeyer4, Georg Weiglein2, and Daniel Dercks3 — 1Universität Bonn — 2Deutsches Elektronen-Synchrotron Hamburg — 3Universität Hamburg — 4Instituto de Física Teórica Madrid
The Higgs boson found at the LHC is experimentally in agreement with the SM prediction. However, it is still a possibility that it consists of an admixture of a CP-even Higgs-like scalar h and a CP-odd pseudoscalar A as described by the general parametrization φ=hcosα+Asinα. Using the program HiggsSignals we investigate the scope of possible deviations of the mixing α from its SM prediction α=0. To this end, we consider Higgs coupling benchmark scenarios with scalar and pseudoscalar scale factors for the couplings to fermions and one common scale factor for the coupling of h to the SU(2) gauge bosons. The latter is assumed to be ≤ 1 as predicted in many models such as SUSY or 2HDM. Although there are no renormalizable couplings of A to the SM gauge bosons at tree level such couplings might be induced through loop corrections of new heavy fields. We investigate this possibility with an effective field theory formulation using higher-dimensional operators. We obtain constraints on α from χ2 fits to the official signal rates from a combined ATLAS and CMS analysis.