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 |
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Authors: | Zhi-Gang Wang Wei-Min Yang Shao-Long Wan |
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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 |
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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
within the framework of the light-cone QCD sum rules approach. The large strong scalar-KK couplings through both the
and
components
,
,
and
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,
and
. From the existing controversial values, we cannot reach a general consensus on the strong coupling constants
and the mixing angles.Received: 9 January 2004, Revised: 23 July 2004, Published online: 2 September 2004 |
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Keywords: | |
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