Chiral Structure of Scalar and Pseudoscalar Mesons

Abstract

We systematically study the chiral structure of local tetraquark currents of flavor singlet and J(P)=0(+). We also investigate their chiral partners, including scalar and pseudoscalar tetraquark currents of flavor singlet, octet, 10, 10_bar and 27. We study their chiral transformation properties. Particularly, we use the tetraquark currents belonging to the "non-exotic" [(3_bar,3)+(3,3_bar)] chiral multiplets to calculate the masses of light scalar mesons through QCD sum rule. The two-point correlation functions are calculated including all terms and only the connected parts. The results are consistent with the experimental values.

45 pages, 7 figures, 7 tables, to appear in Advances in High Energy Physics

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• The hidden-charm pentaquark and tetraquark states
• Pentaquark and Tetraquark states
• An updated review of the new hadron states
• A review of the open charm and open bottom systems
• Decay properties of the $Z_c(3900)$ through the Fierz rearrangement