%0 Journal Article
%T Constraints on Axion Models from $K^+\to¦Ð^+ a$
%A Mark Hindmarsh
%A Photis Moulatsiotis
%J Physics
%D 1998
%I arXiv
%R 10.1103/PhysRevD.59.055015
%X We explore a new class of axion models in which some, but not all, of the left-handed quarks have a Peccei-Quinn symmetry. These models are potentially afflicted by flavour changing neutral currents. We derive the bounds on the Peccei-Quinn symmetry-breaking scale from bounds on the $K^+\to \pi^+ a$ branching ratio, showing that in some cases they are even stronger than the astrophysical ones, but still not strong enough to kill off the models.
%U http://arxiv.org/abs/hep-ph/9807363v2