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arXiv · 0905.3706

Decay of light scalar mesons into vector-photon and into pseudoscalar mesons

Francesco Giacosa·Giuseppe Pagliara
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Abstract

The decays of a light scalar meson into a vector meson and a photon ($S\to Vγ)$ are evaluated in the tetraquark and quarkonium assignments of the scalar states. A link with the radiative decays $ϕ\to Sγ$ is established: experimental results for $S\to Vγ$ will allow to understand if the direct, quark-loop contribution to $ϕ\to Sγ$ or the kaon-loop contribution is dominant. Also strong decays $S\to PP$ -where $P$ denotes a pseudoscalar meson- are investigated: the tetraquark assignment works better than the quarkonium one. It is then also discussed why the tetraquark assignment is favoured with respect to a loosely bound kaonic molecular interpretation of $a_{0}(980)$ and $f_{0}(980)$ mesons.

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Francesco Giacosa, Giuseppe Pagliara. 2009-05-22. Decay of light scalar mesons into vector-photon and into pseudoscalar mesons. https://doi.org/10.1016/j.nuclphysa.2009.12.007

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