Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2006-09-18
Phys.Lett.B650:369-372,2007
Physics
High Energy Physics
High Energy Physics - Phenomenology
4 pages, 2 figures; reference added, minor corrections; version to appear in Physics Letters B
Scientific paper
10.1016/j.physletb.2007.05.031
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.
Chen Hua-Xing
Hosaka Atsushi
Zhu Shi-Lin
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