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Analyzing the CP Nature of a New Scalar Particle via S->Zh Decay · Around

2016

Analyzing the CP Nature of a New Scalar Particle via S->Zh Decay

Bauer, Martin, Neubert, Matthias, Thamm, Andrea

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Scalar particles $S$ which are singlets under the Standard Model gauge group are generic features of many models of fundamental physics, in particular as possible mediators to a hidden sector.

We show that the decay $S\to Zh$ provides a powerful probe of the CP nature of the scalar, because it is allowed only if $S$ has CP-odd interactions.
We perform a model-independent analysis of this decay using an effective Lagrangian and compute the relevant Wilson coefficients arising from integrating out heavy fermions to one-loop order.

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