Structures of the f 0(980), a 0(980) mesons and the strong coupling constants with light-cone QCD sum rules
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
* e-mail: email@example.com
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.
© Springer-Verlag, 2004