A QCD sum rule study of the light scalar mesons
Department of Science Education, Asia Pacific Center for Theoretical Physics, POSTECH, 790-784, Pohang, South Korea
2 Chungbuk National University, 361-763, Cheongju Chungbuk, South Korea
Accepted: 15 September 2006
Published online: 6 October 2006
We examine the interpretation of the light scalar meson nonet as bound states of the scalar diquark and the scalar antidiquark using the QCD sum rule approach. Our results are obtained by means of the operator product expansion (OPE) including operators up to dimension 8. They show no evidence of the coupling of the tetraquark states to the light scalar meson nonet.
PACS: 11.55.Hx Sum rules – / 12.38.Aw General properties of QCD (dynamics, confinement, etc.) – / 12.38.Lg Other nonperturbative calculations –
© Società Italiana di Fisica and Springer-Verlag, 2006