Decay of Z into Three Pseudoscalar Bosons

Abstract

We consider the decay of the $Z$ boson into three pseudoscalar bosons in a general two-Higgs-doublet model. Assuming $m_A$ to be very small, and that of the two physical neutral scalar bosons $h_1$ and $h_2$, $A$ only couples to $Z$ through $h_1$, we find the $Z\to AAA$ branching fraction to be negligible for moderate values of $\tan \beta \equiv v_2/v_1$, if there is no ${\lambda }_5({\Phi }_1^{†}{\Phi }_2{)}^2+h.c.$ term in the Higgs potential; otherwise there is no absolute bound but very large quartic couplings (beyond the validity of perturbation theory) are needed for it to be observable.

8 pages including 1 fig

References in corpus (2)

• Generic consequences of a supersymmetric U(1) gauge factor at the TeV scale
• Lower Bound on the Pseudoscalar Mass in the Minimal Supersymmetric Standard Model

Cited by in corpus (5)

• Large Two-Loop Contributions to g-2 from a Generic Pseudoscalar Boson
• Three-body decays of Higgs bosons at LEP2 and application to a hidden fermiophobic Higgs
• New physics effects in rare Z decays
• Rare Z-decay into light CP-odd Higgs bosons: a comparative study in different new physics models
• Rare Z-decay into light pseudoscalar bosons in the simplest little Higgs model