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arXiv 0905.3706hep-ph
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轻标量介子衰变为矢量光子和赝标量介子

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

Francesco Giacosa, Giuseppe Pagliara

摘要:

在标量态的四夸克和夸克偶素分配中计算了轻标量介子衰变为矢量介子和光子($S\to Vγ)$)的过程。建立了与辐射衰变$ϕ\to Sγ$的联系:$S\to Vγ$的实验结果将使我们能够理解,如果直接的,夸克环的贡献$ϕ\to Sγ$或K介子环的贡献是占主导地位的。此外,强衰变$S\to PP$ -其中$P$表示一个赝标介子-进行了研究:四夸克指定的工作比夸克偶素。然后还讨论了为什么四夸克的分配是有利于相对于一个松散的束缚的kaonic分子解释的$a_{0}(980)$和$f_{0}(980)$介子。

英文摘要:

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.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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