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Role of a_1(1260) resonance in multipion decays of light vector mesons

N. N. Achasov·A. A. Kozhevnikov
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Abstract

The contribution of the a_1(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 a_1 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 a_1 meson ranging from 1.23 GeV to m_{a_1}=m_rho sqrt{2}=1.09 GeV, the greater factor standing in case of lower mass of the a_1.

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N. N. Achasov, A. A. Kozhevnikov. 2005-02-17. Role of a_1(1260) resonance in multipion decays of light vector mesons. https://doi.org/10.1103/physrevd.71.034015

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