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2013•Unpublished venueRequires access

1 Light Scalar Mesons in the QCD Sum Rule

Hua-Xing Chen, Atsushi Hosaka, Shi-Lin Zhu

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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 ¯qq currents, our result supports a tetraquark structure for low-lying scalar mesons. The nature of light scalar mesons of up, down and strange quarks is not fully understood. 1),2) The expected members are σ(600), κ(800), f0(980) and a0(980) forming a nonet of flavor SU(3). Because they have the same spin and parity as

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What this paper is about

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 ¯qq currents, our result supports a tetraquark structure for low-lying scalar mesons. The nature of light scalar mesons of up, down and strange quarks is not fully understood. 1),2) The expected members are σ(600), κ(800), f0(980) and a0(980) forming a nonet of flavor SU(3). Because they have the same spin and parity as

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Available 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 ¯qq currents, our result supports a tetraquark structure for low-lying scalar mesons. The nature of light scalar mesons of up, down and strange quarks is not fully understood. 1),2) The expected members are σ(600), κ(800), f0(980) and a0(980) forming a nonet of flavor SU(3). Because they have the same spin and parity as

Key concepts: Tetraquark, QCD sum rules, Sum rule in quantum mechanics, Meson, Scalar (mathematics), Particle physics, Physics, Quantum chromodynamics

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