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

Andrea Thamm (JGU Mainz); Cornell U.); JGU Mainz; Martin Bauer (U. Heidelberg); Matthias Neubert (MITP

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

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arxiv 1610.00009 v1 pith:RHDMCVCI submitted 2016-09-30 hep-ph

Martin Bauer (U. Heidelberg) , Matthias Neubert (MITP , JGU Mainz , Cornell U.) , Andrea Thamm (JGU Mainz) This is my paper

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abstract

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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