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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 thedecays and allows also to make further testable predictions. In the kaonicsector, the physical resonances $K_{1}(1270)$ and $K_{1}(1400)$ emerge as mixedobjects 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 compatiblewith previous studies but with a smaller uncertainty. This result may behelpful for testing models beyond the Standard Model of particle physics inwhich decays into the kaonic resonances $K_{1}(1270)$ and $K_{1}(1400)$ areinvestigated.

Phenomenology of axial-vector and pseudovector mesons: decays and mixing in the kaonic sector