Finite width effects in ϕradiative decays
Abstract
Description
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.
20 pages, 6 figures. One reference is corrected. Version to be published in Nuclear Physics A
20 pages, 6 figures. One reference is corrected. Version to be published in Nuclear Physics A