Analyzing the CP Nature of a New Scalar Particle via S→Zh Decays.
Scalar particles S that 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→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.
Institut für Theoretische Physik, Universität Heidelberg, Philosophenweg 16, 69120 Heidelberg, Germany.
Martin
M
Bauer
PRISMA Cluster of Excellence & MITP, Johannes Gutenberg University, 55099 Mainz, Germany.|Department of Physics & LEPP, Cornell University, Ithaca, New York 14853, USA.
Matthias
M
Neubert
PRISMA Cluster of Excellence & MITP, Johannes Gutenberg University, 55099 Mainz, Germany.
Andrea
A
Thamm