  We study the decays of the lightest axial-vector and pseudovector mesons,
interpreted as quark-antiquark states, into a vector and a pseudoscalar meson.
We show that the quarkonium assignment delivers a good description of the
decays and allows also to make further testable predictions. In the kaonic
sector, the physical resonances $K_{1}(1270)$ and $K_{1}(1400)$ emerge as mixed
objects of an axial vector state $K_{1,A}$ and a pseudovector state $K_{1,B}$.
We determine the mixing angle as $\left\vert
\theta_{K}\right\vert=\left(33.6\pm4.3\right) ^{\circ}$, a value compatible
with previous studies but with a smaller uncertainty. This result may be
helpful for testing models beyond the Standard Model of particle physics in
which decays into the kaonic resonances $K_{1}(1270)$ and $K_{1}(1400)$ are
investigated.
