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

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.

This letter is a significantly rewritten descendent of our previous work arXiv:1607.01016, which was motivated by the 750 GeV diphoton resonance. The current version contains relevant new material and is independent of the existence of such a resonance (6 pages, 4 figures; accepted for publication in Phys. Rev. Lett.)

References in corpus (1)

• The global electroweak fit at NNLO and prospects for the LHC and ILC

Cited by in corpus (13)

• Collider Probes of Axion-Like Particles
• The Low-Energy Effective Theory of Axions and ALPs
• Flavor probes of axion-like particles
• Effective Theory for a Heavy Scalar Coupled to the SM via Vector-Like Quarks
• Searching for axion-like particles at future electron-positron colliders
• A Consistent Theory of Kinetic Mixing and the Higgs Low-Energy Theorem
• Searching for axionlike particle at future $ep$ colliders
• Probing the Interactions of Axion-Like Particles with Electroweak Bosons and the Higgs Boson in the High Energy Regime at LHC
• ALP-ine quests at the LHC: hunting axion-like particles via peaks and dips in $t\bar{t}$ production
• ALPs, the on-shell way
• Top-quark spin correlations as a tool to distinguish pseudoscalar $A\to ZH$ and scalar $H\to ZA$ signatures in $Zt\bar{t}$ final states at the LHC
• Axion Couplings in Gauged $U(1{)}^{\prime }$ Extensions of the Standard Model
• Hyper Stealth Dark Matter and Long-Lived Particles