We explore the validity of vector meson dominance in the radiative decay of the b1(1235) meson. In order to explain the violation of the vector meson dominance hypothesis in this decay process, we investigate a model where the b1 meson strongly couples with the local current in tensor bilinear representation. The tensor representation is investigated in the framework of the operator product expansion and we found a low energy decay process that does not follow the usual vector meson dominance hypothesis. The ω-like intermediate meson state of quantum numbers IG(JPC) = 0−(1− −) is found to have a nontrivial role in the decay process of the b1 meson. The spectral structure of the ω-like state is found to be close to a π-ρ hybrid state, which provides a mechanism that evades the usual vector meson dominance hypothesis. Precise measurements of various decay channels of the b1 meson are, therefore, required to unravel the internal structure of axial vector mesons.
Bibliographical noteFunding Information:
Open Access, ©c The Authors. Article funded by SCOAP3.
This work was supported by the National Research Foundation of Korea under Grant Nos. NRF-2017R1D1A1B03033685 (K.S.J.), NRF-2016R1D1A1B03930089 (S.H.L.), and NRF-2015R1D1A1A01059603 (Y.O.).
All Science Journal Classification (ASJC) codes
- Nuclear and High Energy Physics