Role of a1(1260) resonance in multipion decays of light vector mesons
Abstract
The contribution of the a1(1260) meson to the amplitudes of the decays rho(770) to 4 pi, omega(782) to 5 pi, and phi(1020) to 5 pi is analyzed in the chiral model of pseudoscalar, vector, and axial vector mesons based on the generalized hidden local symmetry added with the anomalous terms. The analysis shows that inclusion of a1 meson in the intermediate states results in enhancement of the branching ratios of the above decays by the factor ranging from 1.3 to 1.9 depending on the mass of a1 meson ranging from 1.23 GeV to ma1=mrho sqrt2=1.09 GeV, the greater factor standing in case of lower mass of the a1.
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