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We study the properties of axial vector mesons a1 and b1 as relativisticS-wave states which are predicted in the U~(12)-scheme, through the analyses oftheir radiative and pionic decays. Specifically, partial widths of the stronga1 (b1) -> rho(omega) pi processes, their D/S-wave amplitude ratios, andradiative transition widths of a1(b1) -> pi gamma processes are calculated byusing a simple decay interaction model, and made a comparison with therespective experimental values.

The qqbar S-wave axial-vector mesons in the covariant U~(12)-scheme