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The "forgotten" decay S -> Z+h as a CP analyzer · Around

2016

The "forgotten" decay S -> Z+h as a CP analyzer

Bauer, Martin, Neubert, Matthias, Thamm, Andrea

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Scalar particles $S$ which are gauge singlets under the Standard Model are generic features of many models of fundamental physics, in particular as possible mediators to a hidden or dark 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 in the context of an effective Lagrangian and compute the relevant Wilson coefficients arising from integrating out heavy fermions to one-loop order.
We illustrate our findings with the example of the 750 GeV diphoton resonance seen by ATLAS and CMS and show that the $S\to Zh$ decay rate could naturally be of similar magnitude or larger than the diphoton rate.

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