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Finite width effects in ϕradiative decays

Jose A. Oller
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Abstract

The decay widths ϕ\to γf_0(980) and ϕ\to γa_0(980) are calculated taking into account the finite widths of the scalar resonances f_0(980) and a_0(980). The latter are shown to be essential in order to obtain meaningful results. Simultaneously we also study the decays ϕ\to γπ^0π^0 and γπ^0ηwhere a good reproduction of the recent experimental data is obtained, pointing out the necessity of a ϕγK^0\bar{K}^0 contact vertex. The calculated decay rates to γf_0(980) and γa_0(980) are in good agreement with the experimental ones without invoking isospin breaking in the couplings of the f_0(980) and a_0(980) resonances to the K^+ K^- and K^0 \bar{K}^0 channels, at odds with recent proposals. The derived formula for calculating these ϕradiative decay widths can be also applied in their own experimental analyses in order to obtain more precise results.

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Jose A. Oller. 2002-11-11. Finite width effects in ϕradiative decays. https://doi.org/10.1016/s0375-9474(02)01360-x

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