Structures of the f 0(980), a 0(980) mesons and the strong coupling constants g_{f_0 K^+ K^-} , g_{a_0 K^+ K^-} with light-cone QCD sum rules期刊界 All Journals 搜尽天下杂志传播学术成果专业期刊搜索期刊信息化学术搜索

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Structures of the f 0(980), a 0(980) mesons and the strong coupling constants g_{f_0 K^+ K^-} , g_{a_0 K^+ K^-} with light-cone QCD sum rules

Authors:	Zhi-Gang Wang Wei-Min Yang Shao-Long Wan

Institution:	(1) Department of Physics, North China Electric Power University, 071003 Baoding, P.R. China;(2) CCAST (World Laboratory), P.O. Box 8730, 100080 Beijing, P.R. China;(3) Department of Modern Physics, University of Science and Technology of China, 230026 Hefei, P.R. China

Abstract:	Making the assumption of explicit isospin violation arising from f ₀(980)-a ₀(980) mixing, we take the point of view that the scalar mesons f ₀(980) and a ₀(980) have both strange and non-strange quark-antiquark components and evaluate the strong coupling constants $g_{f_0 K^+ K^-} \mathrm{and} g_{a_0 K^+ K^-}$ within the framework of the light-cone QCD sum rules approach. The large strong scalar-KK couplings through both the $n\bar{n}$ and $s\bar{s}$ components $g^{\bar{n}n}_{f_0 K^ + K^-}$ , $g^{\bar{s}s}_{f_0 K^ + K^-}$ , $g^{\bar{n}n}_{a_0 K^ + K^-}$ and $g^{\bar{s}s}_{a_0 K^ + K^-}$ will support the hadronic dressing mechanism; furthermore, in spite of the constituent structure differences between the f ₀(980) and a ₀(980) mesons, the strange components have larger strong coupling constants with the K ⁺ K ^- state than the corresponding non-strange ones, $g_{f_0 K^ + K^-}^{\bar{s}s}\approx \sqrt{2}g_{f_0 K^ + K^-}^{\bar{n}n}$ and $g_{a_0 K^ + K^-}^{\bar{s}s}\approx \sqrt{2} g_{a_0 K^ + K^-}^{\bar{n}n}$ . From the existing controversial values, we cannot reach a general consensus on the strong coupling constants $g_{f_0 K^+ K^-} , g_{a_0 K^+ K^-}$ and the mixing angles.Received: 9 January 2004, Revised: 23 July 2004, Published online: 2 September 2004

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