https://doi.org/10.1140/epja/i2013-13135-3
Regular Article - Theoretical Physics
Phenomenology of axial-vector and pseudovector mesons: decays and mixing in the kaonic sector
Institut für Theoretische Physik, Johann Wolfgang Goethe - Universität, Max von Laue-Str. 1, 60438, Frankfurt am Main, Germany
* e-mail: giacosa@th.physik.uni-frankfurt.de
Received:
6
June
2013
Revised:
2
October
2013
Accepted:
3
October
2013
Published online:
30
October
2013
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 |θ K | = (33.6 ± 4.3)°, 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.
© SIF, Springer-Verlag Berlin Heidelberg, 2013
