QCD sum rule approach for the light scalar mesons as four-quark states

We study the two point-function for the scalar mesons σ, κ, f0(980) and a0(980) as diquak–antidiquark states. We also study the decays of these mesons into ππ, Kπ and KK¯. We find that the couplings are consistent with existing experimental data, supporting the four-quark structure for the light sca...

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Bibliographic Details
Published in:Physics letters. B 2005-02, Vol.608 (1-2), p.69-76
Main Authors: Brito, Thiago V., Navarra, Fernando S., Nielsen, Marina, Bracco, Mirian E.
Format: Article
Language:English
Subjects:
Exact sciences and technology
General theory of fields and particles
Hadronic decays of mesons
Other nonperturbative calculations
Physics
Quantum chromodynamics
S matrix theory
analytic structure of amplitudes
Specific reactions and phenomenology
Specific theories and interaction models
particle systematics
Sum rules
The physics of elementary particles and fields
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Summary:We study the two point-function for the scalar mesons σ, κ, f0(980) and a0(980) as diquak–antidiquark states. We also study the decays of these mesons into ππ, Kπ and KK¯. We find that the couplings are consistent with existing experimental data, supporting the four-quark structure for the light scalar mesons.
ISSN:0370-2693
1873-2445
DOI:10.1016/j.physletb.2005.01.008