Light Scalar Mesons as Tetraquarks within QCD Sum Rules(Tetraquarks and related topics, Exotic hadrons, New Frontiers in QCD-Exotic Hadrons and Hadronic Matter-)

概要

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We examine the interpretation of the light scalar meson nonet as tetraquark states using QCD sum rules. With the interpolating current for the tetraquark states composed of scalar diquark and scalar antidiquark, first, we construct the QCD sum rules by means of the operator product expansion up to the operators of dimension 8 and show that there is no evidence of the coupling of the tetraquark states to the light scalar meson nonet. In order to have a stable sum rule, we propose a "good" interpolating current for the tetraquarks based on chirality arguments which includes scalar and pseudoscalar diquark-antidiquarks with equal weights. In particular, for the lowest tetraquark σ-meson, we perform detail analysis of the QCD sum rule and obtain mass for the σ(600) around 780 MeV.
理論物理学刊行会の論文
2007-11-09