Meson loops in the f0(980) and a0(980) radiative decays into ρ , ω |
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Authors: | H Nagahiro L Roca E Oset |
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Institution: | (1) Research Center for Nuclear Physics (RCNP), Ibaraki, 567-0047 Osaka, Japan;(2) Departamento de Fısica, Universidad de Murcia, E-30071 Murcia, Spain;(3) Yukawa Institute for Theoretical Physics, Kyoto University, 606-8502 Kyoto, Japan;(4) Departamento de Fısica Teórica and IFIC, Centro Mixto Universidad de Valencia-CSIC, Institutos de Investigación de Paterna, Aptdo. 22085, 46071 Valencia, Spain |
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Abstract: | We calculate the radiative decay widths of the a
0(980) and f
0(980) scalar mesons into ργ and ωγ considering the dynamically generated nature of these scalar resonances within the realm
of the chiral unitary approach. The main ingredient in the evaluation of the radiative width of the scalar mesons are the
loops coming from the decay into their constituent pseudoscalar-pseudoscalar components and the subsequent radiation of the
photon. The dominant diagrams with only pseudoscalar mesons in the loops are found to be convergent while the divergence of
those with a vector meson in the loop are written in terms of the two-meson loop function easily regularizable. We provide
results for all the possible charge channels and obtain results, with uncertainties, which differ significantly from quark
loops models and some version of vector meson dominance. |
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Keywords: | 14 40 Cs Other mesons with S = C = 0 mass < 2 5 GeV 13 25 Jx Decays of other mesons 13 40 Hq Electromagnetic decays |
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