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T: Fachverband Teilchenphysik

T 57: Higgs III

T 57.5: Vortrag

Mittwoch, 21. März 2018, 17:30–17:45, Z6 - HS 0.004

Measurement of Higgs CP properties in fermionic couplings with the CMS Detector — David Brunner, Jordy Degens, Peter Fackeldey, Olena Hlushchenko, Wolfgang Lohmann, Johannes Merz, Thomas Müller, Alexander Nehrkorn, Claudia Pistone, Dennis Roy, Hale Sert, Achim Stahl, and •Dominik Wolfschläger — III. Physikalisches Institut B, RWTH Aachen University

The discovery of CP violation in the Higgs sector would be a clear indication for physics beyond the standard model. While recent results exclude that the Higgs boson of mass 125 GeV is a pure pseudoscalar particle, a small admixture of scalar and pseudoscalar contributions is still a valid scenario. This talk presents an analysis dedicated to the measurement of the scalar and pseudoscalar couplings of the discovered Higgs boson. The search for small pseudoscalar contributions is motivated in terms of an effective field theory where scalar and pseudoscalar contributions enter at the same pertubative order in gluon-gluon-fusion Higgs production. The azimuthal angle difference Δ φ_jj between initial state jets produced in gg→ Hjj events is sensitive to the underlying pseudoscalar γ⁵ tensor structure. A statistical analysis based on Δ φ_jj is performed, providing an expected analysis sensitivity to CP properties for an integrated luminosity of L = 35.9 fb⁻¹ at √s=13 TeV collected with the CMS Detector in 2016.