1997/08/08 by E. Keith, Ernest Ma · 1 citation
Physics and Astronomy · #Dark Matter and Cosmic Phenomena #Neutrino Physics Research #Particle physics theoretical and experimental studies #hep-ph
paper · pdf · doi:10.1103/physrevd.57.2017
published as Phys.Rev. D57 (1998) 2017-2019 · 8 pages including 1 fig
arxiv created 1997/08/08 · openalex publication_date 1998/02/01 · arxiv updated 2009/11/30 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28
We consider the decay of the Z boson into three pseudoscalar bosons in a general two-Higgs-doublet model. Assuming mA to be very small, and that of the two physical neutral scalar bosons h1 and h2, A only couples to Z through h1, we find the \stackrel\ensuremath→ZAAA branching fraction to be negligible for moderate values of tan\ensuremathβ\ensuremath≡v2/v1, if there is no \ensuremathλ5(\ensuremathΦ1^\ifmmode†\else\textdagger\fi\ensuremathΦ2)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.