Abstract
Abstract
We explore the validity of vector meson dominance in the radiative decay of the b
1(1235) meson. In order to explain the violation of the vector meson dominance hypothesis in this decay process, we investigate a model where the b
1 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 I
G
(J
PC
) = 0−(1− −) is found to have a nontrivial role in the decay process of the b
1 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 b
1 meson are, therefore, required to unravel the internal structure of axial vector mesons.
Publisher
Springer Science and Business Media LLC
Subject
Nuclear and High Energy Physics
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