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Free keywords:
High Energy Physics - Phenomenology, hep-ph,High Energy Physics - Experiment, hep-ex
Abstract:
We explore the prospects to discover the $h \to Z \gamma$ decay in $t\bar
t$-associated production, featuring a signal-to-background ratio of ${\cal
O}(1)$. Performing a detailed analysis of the semi-leptonic $t \bar t $-decay
channel, we demonstrate that the production mode could lead to a
$\sim5\,\sigma$ discovery at the high-luminosity LHC, while the effective $h Z
\gamma$ coupling could be extracted with a $\sim15\,\%$ accuracy. Extending the
analysis to potential future $pp$ colliders with 27 TeV and 100 TeV
center-of-mass energies, we also show that the latter would allow precision
measurements at the few percent level, rendering possible precise extractions
of the spin and CP properties of the Higgs boson.
