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 Publish in OALib Journal ISSN: 2333-9721 APC: Only $99  Views Downloads  Relative Articles Scalar Meson Decay Constants and the Nature of the a_0(980) On the Nature of the Scalar a_0(980) and f_0(980)-Mesons Nature of the scalar$a_0(980)$and$f_0(980)$-mesons On nature of scalar a_0(980) and f_0(980)-mesons Study of the a_0(980) meson via the radiative decay phi->eta pi^0 gamma with the KLOE detector Study of the a_0(980) on the lattice Near-threshold production of$a_0(980)$-mesons in$πN$and NN collisions and$a_0/f_0$-mixing Radiative decays of scalar mesons$f_0(980)$and$a_0(980)$into$\rho(\omega) \gamma$in the local Nambu-Jona-Lasinio model The theoretical predictions for the study of the$a_0(980)$and$f_0(980)$mesons in the$φ$radiative decays Isospin breaking and$f_0(980)$-$a_0(980)$mixing in the$η(1405) \to π^{0} f_0(980)\$ reaction More...
Physics  2010

# Nature of the a_0(980) Meson in the Light of Photon-Photon Collisions

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Abstract:

New high-statistics Belle data on the reaction \gamma\gamma\to\pi^0\eta are analyzed to clarify the two-photon production mechanisms and the nature of the a_0(980) meson. The obtained solution for the amplitude \gamma\gamma\to\pi^0\eta is consistent with the chiral theory expectation for the \pi\eta scattering length, with the strong coupling of the a_0(980) to the \pi\eta, K\bar K, and \pi\eta' channels, and with a key role of the rescattering mechanisms a_0(980)\to(K\bar K+ \pi^0\eta+\pi^0\eta')\to\gamma\gamma in the a_0(980)\to\gamma\gamma decay. Such a picture argues in favor of the q^2\bar q^2 nature of the a_0(980) meson and is in agreement with the properties of its partners, the \sigma_0(600) and f_0(980) mesons, in particular, with those that manifest themselves in \gamma\gamma\to\pi\pi. An important role of the vector meson exchanges in the formation of the nonresonant background in \gamma\gamma\to\pi^0\eta is also revealed. The preliminary information on the reaction \pi^0\eta\to\pi^0\eta is obtained.

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