Light Scalar Tetraquark Mesons in the QCD Sum Rule

Details Light Scalar Tetraquark Mesons in the QCD Sum Rule Light Scalar Tetraquark Mesons in the QCD Sum Rule

2007-07-31

arxiv.org/abs/0707.4586v2

Phys.Rev.D76:094025,2007

Physics

High Energy Physics

High Energy Physics - Phenomenology

18 pages, 5 figures; reference added, minor corrections; version to appear in Phys.Rev.D

Scientific paper

10.1103/PhysRevD.76.094025

We study the lowest-lying scalar mesons in the QCD sum rule by considering them as tetraquark states. We find that there are five independent currents for each state with a certain flavor structure. By forming linear combinations, we find that some mixed currents give reliable QCD sum rules. Among various tetraquark currents, we consider those which are constructed by the diquarks having anti-symmetric and symmetric flavor structures. That the results of the QCD sum rule derived from the two types of currents are similar suggests that the tetraquark states can have a large mixing between different flavor structures.

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