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Decay of axial-vector mesons into VP and P$γ$

L. Roca·J. E. Palomar·E. Oset
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Abstract

We propose a phenomenological Lagrangian for the decay of the SU(3) nonets of the axial-vector mesons of $J^{PC}=1^{+-},1^{++}$ into a vector meson and a pseudoscalar constructed with tensor fields for the vector and axial-vector mesons. The formulation leads to a good reproduction of the different decay branching ratios and assuming vector meson dominance (VMD) it also leads to good results for the radiative decay of the $a_1$ into pion and photon, and in agreement with the structure proposed in the chiral tensor formulation of radiative decay of axial-vector mesons. The two SU(3) parameters and the mixing angle of $K_{1A}$ and $K_{1B}$ needed to give the physical $K_1(1270)$ and $K_1(1400)$ resonances are also determined.

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L. Roca, J. E. Palomar, E. Oset. 2004-08-26. Decay of axial-vector mesons into VP and P$γ$. https://doi.org/10.1103/physrevd.70.094006

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