Light Scalar Mesons in the QCD Sum Rule
Hua-Xing Chen, Atsushi Hosaka, and Shi-Lin Zhu
TL;DR
This paper investigates the internal structure of light scalar mesons using QCD sum rules, providing evidence that supports a tetraquark configuration over traditional quark-antiquark models.
Contribution
It identifies five independent scalar tetraquark currents and demonstrates through sum rule analysis that low-lying scalar mesons are better described as tetraquarks.
Findings
Supports tetraquark structure for low-lying scalar mesons
Identifies five independent scalar tetraquark currents
Shows sum rule analysis favors tetraquark interpretation
Abstract
We study the light scalar mesons in the QCD sum rule. We find that there are five independent scalar tetraquark currents in the local form, and we perform QCD sum rule analysis using both these currents and their combinations. Compared with the sum rules by conventional \bar{q} q currents, our result supports a tetraquark structure for low-lying scalar mesons.
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