QCD Sum Rule Study of the Masses of Light Tetraquark Scalar Mesons

Abstract

We study the low-lying scalar mesons of light u, d, s flavors in the QCD sum rule. Having all possible combinations of tetraquark currents in the local form, QCD sum rule analysis has been carefully performed. We found that using the appropriate tetraquark currents, the masses of sigma, kappa, f_0 and a_0 mesons appear in the region of 0.6 -- 1 GeV with the expected ordering. The results are compared with that of the conventional \bar{q} q currents, where the masses are considerably larger.

4 pages, 2 figures; reference added, minor corrections; version to appear in Physics Letters B

References in corpus (3)

• Exotic Tetraquark ud bar[s] bar[s] of J^P=0^+ in the QCD Sum Rule
• Instanton interpolating current for $\sigma$--tetraquark
• Pentaquark state in pole-dominated QCD sum rules

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