Papers โบ Indirect ๐๐ซ probes of the Higgs-top-quark interaction: current LHC constraints and...
Indirect ๐๐ซ probes of the Higgs-top-quark interaction: current LHC constraints and future opportunities
Henning Bahl, Philip Bechtle, Sven Heinemeyer, Judith Katzy, Tobias Klingl, Krisztian Peters, Matthias Saimpert, Tim Stefaniak, Georg Weiglein
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The ๐๐ซ structure of the Higgs boson in its coupling to the particles of the Standard Model is amongst the most important Higgs boson properties which have not yet been constrained with high precision. In this study, all relevant inclusive and differential Higgs boson measurements from the ATLAS and CMS experiments are used to constrain the ๐๐ซ-nature of the top-Yukawa interaction. The model dependence of the constraints is studied by successively allowing for new physics contributions to the couplings of the Higgs boson to massive vector bosons, to photons, and to gluons. In the most general case, we find that the current data still permits a significant ๐๐ซ-odd component in the top-Yukawa coupling. Furthermore, we explore the prospects to further constrain the ๐๐ซ properties of this coupling with future LHC data by determining tH production rates independently from possible accompanying variations of the ttฬ H rate. This is achieved via a careful selection of discriminating observables. At the HL-LHC, we find that evidence for tH production at the Standard Model rate can be achieved in the Higgs to diphoton decay channel alone.
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