Münster 2017 – scientific programme

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T: Fachverband Teilchenphysik

T 39: Higgs-Physik (Theorie) 1

T 39.2: Talk

Tuesday, March 28, 2017, 11:15–11:30, VSH 06

Exclusive radiative Higgs decays in the Standard Model and beyond — •Stefan Alte — PRISMA Cluster of Excellence and Mainz Institute for Theoretical Physics, Johannes Gutenberg University, 55099 Mainz

We present a detailed analysis of the rare exclusive Higgs-boson decays h→ M V into a single meson M and an electroweak gauge boson V=Z,W,γ. We discuss these decays within the Standard Model and investigate the possibility of using these processes as probes for non-standard Higgs couplings. To this end, we employ an effective Lagrangian with modified Higgs couplings to account for possible new-physics effects in a model-independent way. We show that measurements of the decays h→ MZ can be used to extract information about the CP-even and CP-odd hγ Z couplings. Some of the h→ MW decay modes exhibit a very strong dependence on the flavour-changing Higgs couplings involving the top quark. The decays h→ Mγ can serve as probes of the light-quark Yukawa couplings.